[MC] De-capitalize SwitchSection. NFC

Add SwitchSection to return switchSection. The API will be removed soon.

[MC] De-capitalize MCStreamer functions

Follow-up to c031378ce01b8485ba0ef486654bc9393c4ac024 .
The class is mostly consistent now.

[NFC][MC] remove unused argument `MCRegisterInfo` in `MCCodeEmitter`

Reviewed By: skan

Differential Revision: https://reviews.llvm.org/D119846

Revert "[NFC][MC] remove unused argument `MCRegisterInfo` in `MCCodeEmitter`"

This reverts commit fe25c06cc5bdc2ef9427309f8ec1434aad69dc7a.

[NFC][MC] remove unused argument `MCRegisterInfo` in `MCCodeEmitter`

For ten years, it seems that `MCRegisterInfo` is not used by any target.

Reviewed By: skan

Differential Revision: https://revie

[NFC][MC] remove unused argument `MCRegisterInfo` in `MCCodeEmitter`

For ten years, it seems that `MCRegisterInfo` is not used by any target.

Reviewed By: skan

Differential Revision: https://reviews.llvm.org/D119846

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Cleanup LLVMObject headers

Most notably,

llvm/Object/Binary.h no longer includes llvm/Support/MemoryBuffer.h
llvm/Object/MachOUniversal*.h no longer include llvm/Object/Archive.h
llvm/Object/TapiUn

Cleanup LLVMObject headers

Most notably,

llvm/Object/Binary.h no longer includes llvm/Support/MemoryBuffer.h
llvm/Object/MachOUniversal*.h no longer include llvm/Object/Archive.h
llvm/Object/TapiUniversal.h no longer includes llvm/Object/TapiFile.h

llvm-project preprocessed size:
before: 1068185081
after: 1068324320

Discourse thread: https://discourse.llvm.org/t/include-what-you-use-include-cleanup
Differential Revision: https://reviews.llvm.org/D119457

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Cleanup LLVMMC headers

There's a few relevant forward declarations in there that may require downstream
adding explicit includes:

llvm/MC/MCContext.h no longer includes llvm/BinaryFormat/ELF.h, llv

Cleanup LLVMMC headers

There's a few relevant forward declarations in there that may require downstream
adding explicit includes:

llvm/MC/MCContext.h no longer includes llvm/BinaryFormat/ELF.h, llvm/MC/MCSubtargetInfo.h, llvm/MC/MCTargetOptions.h
llvm/MC/MCObjectStreamer.h no longer include llvm/MC/MCAssembler.h
llvm/MC/MCAssembler.h no longer includes llvm/MC/MCFixup.h, llvm/MC/MCFragment.h

Counting preprocessed lines required to rebuild llvm-project on my setup:
before: 1052436830
after: 1049293745

Which is significant and backs up the change in addition to the usual benefits of
decreasing coupling between headers and compilation units.

Discourse thread: https://discourse.llvm.org/t/include-what-you-use-include-cleanup
Differential Revision: https://reviews.llvm.org/D119244

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[unittest][DebugInfo/DWARF] Do not report skipped tests as passed

This is similar to what we have already done to some other tests.
See D102643, D102710, D102754.

Differential Revision: https://rev

[unittest][DebugInfo/DWARF] Do not report skipped tests as passed

This is similar to what we have already done to some other tests.
See D102643, D102710, D102754.

Differential Revision: https://reviews.llvm.org/D116108

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Move TargetRegistry.(h|cpp) from Support to MC

This moves the registry higher in the LLVM library dependency stack.
Every client of the target registry needs to link against MC anyway to
actually us

Move TargetRegistry.(h|cpp) from Support to MC

This moves the registry higher in the LLVM library dependency stack.
Every client of the target registry needs to link against MC anyway to
actually use the target, so we might as well move this out of Support.

This allows us to ensure that Support doesn't have includes from MC/*.

Differential Revision: https://reviews.llvm.org/D111454

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[MC] Use local MCSubtargetInfo in writeNops

On some architectures such as Arm and X86 the encoding for a nop may
change depending on the subtarget in operation at the time of
encoding. This change r

[MC] Use local MCSubtargetInfo in writeNops

On some architectures such as Arm and X86 the encoding for a nop may
change depending on the subtarget in operation at the time of
encoding. This change replaces the per module MCSubtargetInfo retained
by the targets AsmBackend in favour of passing through the local
MCSubtargetInfo in operation at the time.

On Arm using the architectural NOP instruction can have a performance
benefit on some implementations.

For Arm I've deleted the copy of the AsmBackend's MCSubtargetInfo to
limit the chances of this causing problems in the future. I've not
done this for other targets such as X86 as there is more frequent use
of the MCSubtargetInfo and it looks to be for stable properties that
we would not expect to vary per function.

This change required threading STI through MCNopsFragment and
MCBoundaryAlignFragment.

I've attempted to take into account the in tree experimental backends.

Differential Revision: https://reviews.llvm.org/D45962

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[MC] Add MCSubtargetInfo to MCAlignFragment

In preparation for passing the MCSubtargetInfo (STI) through to writeNops
so that it can use the STI in operation at the time, we need to record the
STI i

[MC] Add MCSubtargetInfo to MCAlignFragment

In preparation for passing the MCSubtargetInfo (STI) through to writeNops
so that it can use the STI in operation at the time, we need to record the
STI in operation when a MCAlignFragment may write nops as padding. The
STI is currently unused, a further patch will pass it through to
writeNops.

There are many places that can create an MCAlignFragment, in most cases
we can find out the STI in operation at the time. In a few places this
isn't possible as we are in initialisation or finalisation, or are
emitting constant pools. When possible I've tried to find the most
appropriate existing fragment to obtain the STI from, when none is
available use the per module STI.

For constant pools we don't actually need to use EmitCodeAlign as the
constant pools are data anyway so falling through into it via an
executable NOP is no better than falling through into data padding.

This is a prerequisite for D45962 which uses the STI to emit the
appropriate NOP for the STI. Which can differ per fragment.

Note that involves an interface change to InitSections. It is now
called initSections and requires a SubtargetInfo as a parameter.

Differential Revision: https://reviews.llvm.org/D45961

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[DWARF] Expose raw bytes in DWARFExpression

This information is necessary for clients of DebugInfo that
do not want to process a DWARF expression, but just treat it as a blob
of data. In BOLT, for e

[DWARF] Expose raw bytes in DWARFExpression

This information is necessary for clients of DebugInfo that
do not want to process a DWARF expression, but just treat it as a blob
of data. In BOLT, for example, we need to read these expressions in
CFIs and write them back to the binary, unchanged, so having access to
the original expression encoding is a shortcut to avoid the need to
re-encode the entire expression when re-writing exception handling
info (CFIs).

This patch is an alternative to https://reviews.llvm.org/D98301, in
which we implement the support to re-encode these expressions. But
since we don't really need to change anything in these expressions,
we can just copy their bytes.

Reviewed By: aprantl

Differential Revision: https://reviews.llvm.org/D107515

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