[MC] De-capitalize SwitchSection. NFC

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

[XCOFF][AIX] Use unique section names for LSDA and EH info sections with -ffunction-sections

Summary:
When -ffunction-sections is on, this patch makes the compiler to generate unique LSDA and EH inf

[XCOFF][AIX] Use unique section names for LSDA and EH info sections with -ffunction-sections

Summary:
When -ffunction-sections is on, this patch makes the compiler to generate unique LSDA and EH info sections for functions on AIX by appending the function name to the section name as a suffix. This will allow the AIX linker to garbage-collect unused function.

Reviewed by: MaskRay, hubert.reinterpretcast

Differential Revision: https://reviews.llvm.org/D124855

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[AsmPrinter] AIXException::endFunction - use cast<> instead of dyn_cast<> to avoid dereference of nullptr

The pointer is used immediately inside the getSymbol() call, so assert the cast is correct i

[AsmPrinter] AIXException::endFunction - use cast<> instead of dyn_cast<> to avoid dereference of nullptr

The pointer is used immediately inside the getSymbol() call, so assert the cast is correct instead of returning nullptr

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Cleanup includes: DebugInfo & CodeGen

Discourse thread: https://discourse.llvm.org/t/include-what-you-use-include-cleanup
Differential Revision: https://reviews.llvm.org/D121332

[PowerPC][AIX] Override markFunctionEnd()

During fast-isel calling 'markFunctionEnd' in the base class will call
tidyLandingPads. This can cause an issue where we have determined that
we need ehinfo

[PowerPC][AIX] Override markFunctionEnd()

During fast-isel calling 'markFunctionEnd' in the base class will call
tidyLandingPads. This can cause an issue where we have determined that
we need ehinfo and emitted a traceback table with the bits set to
indicate that we will be emitting the ehinfo, but the tidying deletes
all landing pads. In this case we end up emitting a reference to
__ehinfo.N symbol, but not emitting a definition to said symbol and the
resulting file fails to assemble.

Differential Revision: https://reviews.llvm.org/D117040

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[AIX][XCOFF] generate eh_info when vector registers are saved according to the traceback table.

Summary:

generate eh_info when vector registers are saved according to the traceback table.

struct e

[AIX][XCOFF] generate eh_info when vector registers are saved according to the traceback table.

Summary:

generate eh_info when vector registers are saved according to the traceback table.

struct eh_info_t {

unsigned version; /* EH info version 0 */
#if defined(64BIT)

char _pad[4]; /* padding */
#endif

unsigned long lsda; /* Pointer to Language Specific Data Area */
unsigned long personality; /* Pointer to the personality routine */
};

the value of lsda and personality is zero when the number of vector registers saved is large zero and there is not personality of the function

Reviewers: Jason Liu
Differential Revision: https://reviews.llvm.org/D103651

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[XCOFF] Handle the case when personality routine is an alias

Summary:
Personality routine could be an alias to another personality routine.
Fix the situation when we compile the file that contains t

[XCOFF] Handle the case when personality routine is an alias

Summary:
Personality routine could be an alias to another personality routine.
Fix the situation when we compile the file that contains the personality
routine and the file also have functions that need to refer to the
personality routine.

Reviewed By: hubert.reinterpretcast

Differential Revision: https://reviews.llvm.org/D101401

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[XCOFF][AIX] Emit EH information in traceback table

SUMMARY:

In order for the runtime on AIX to find the compact unwind section(EHInfo table),
we would need to set the following on the traceback ta

[XCOFF][AIX] Emit EH information in traceback table

SUMMARY:

In order for the runtime on AIX to find the compact unwind section(EHInfo table),
we would need to set the following on the traceback table:

The 6th byte's longtbtable field to true to signal there is an Extended TB Table Flag.
The Extended TB Table Flag to be 0x08 to signal there is an exception handling info presents.
Emit the offset between ehinfo TC entry and TOC base after all other optional portions of traceback table.

The patch is authored by Jason Liu.

Reviewers: David Tenty, Digger Lin
Differential Revision: https://reviews.llvm.org/D92766

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[XCOFF][AIX] Generate LSDA data and compact unwind section on AIX

Summary:
AIX uses the existing EH infrastructure in clang and llvm.
The major differences would be
1. AIX do not have CFI instructio

[XCOFF][AIX] Generate LSDA data and compact unwind section on AIX

Summary:
AIX uses the existing EH infrastructure in clang and llvm.
The major differences would be
1. AIX do not have CFI instructions.
2. AIX uses a new personality routine, named __xlcxx_personality_v1.
It doesn't use the GCC personality rountine, because the
interoperability is not there yet on AIX.
3. AIX do not use eh_frame sections. Instead, it would use a eh_info
section (compat unwind section) to store the information about
personality routine and LSDA data address.

Reviewed By: daltenty, hubert.reinterpretcast

Differential Revision: https://reviews.llvm.org/D91455

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