[mlir] Refactor the Parser library in preparation for an MLIR binary format

The current Parser library is solely focused on providing API for
the textual MLIR format, but MLIR will soon also provide

[mlir] Refactor the Parser library in preparation for an MLIR binary format

The current Parser library is solely focused on providing API for
the textual MLIR format, but MLIR will soon also provide a binary
format. This commit renames the current Parser library to AsmParser to
better correspond to what the library is actually intended for. A new
Parser library is added which will act as a unified parser interface
between both text and binary formats. Most parser clients are
unaffected, given that the unified interface is essentially the same as
the current interface. Only clients that rely on utilizing the
AsmParserState, or those that want to parse Attributes/Types need to be
updated to point to the AsmParser library.

Differential Revision: https://reviews.llvm.org/D129605

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[mlir:PDLL] Rework the C++ generation of native Constraint/Rewrite arguments and results

The current translation uses the old "ugly"/"raw" form which used PDLValue for the arguments
and results. Thi

[mlir:PDLL] Rework the C++ generation of native Constraint/Rewrite arguments and results

The current translation uses the old "ugly"/"raw" form which used PDLValue for the arguments
and results. This commit updates the C++ generation to use the recently added sugar that
allows for directly using the desired types for the arguments and result of PDL functions.
In addition, this commit also properly imports the C++ class for ODS operations, constraints,
and interfaces. This allows for a much more convienent C++ API than previously granted
with the raw/low-level types.

Differential Revision: https://reviews.llvm.org/D124817

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[mlir][PDLL] Allow numeric result indexing for unregistered op

If we don't specify the result index while matching operand with the
result of certain operation, it's supposed to match all the result

[mlir][PDLL] Allow numeric result indexing for unregistered op

If we don't specify the result index while matching operand with the
result of certain operation, it's supposed to match all the results of
the operation with the operand. For registered op, it's easy to do that
by either indexing with number or name. For unregistered op, this commit
enables the numeric result indexing for this use case.

Reviewed By: rriddle

Differential Revision: https://reviews.llvm.org/D126330

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[mlir:PDL] Remove the ConstantParams support from native Constraints/Rewrites

This support has never really worked well, and is incredibly clunky to
use (it effectively creates two argument APIs), a

[mlir:PDL] Remove the ConstantParams support from native Constraints/Rewrites

This support has never really worked well, and is incredibly clunky to
use (it effectively creates two argument APIs), and clunky to generate (it isn't
clear how we should actually expose this from PDL frontends). Treating these
as just attribute arguments is much much cleaner in every aspect of the stack.
If we need to optimize lots of constant parameters, it would be better to
investigate internal representation optimizations (e.g. batch attribute creation),
that do not affect the user (we want a clean external API).

Differential Revision: https://reviews.llvm.org/D121569

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[mlir][NFC] Move Parser.h to Parser/

There is no reason for this file to be at the top-level, and
its current placement predates the Parser/ folder's existence.

Differential Revision: https://revie

[mlir][NFC] Move Parser.h to Parser/

There is no reason for this file to be at the top-level, and
its current placement predates the Parser/ folder's existence.

Differential Revision: https://reviews.llvm.org/D121024

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[PDLL] Add support for tablegen includes and importing ODS information

This commit adds support for processing tablegen include files, and importing
various information from ODS. This includes opera

[PDLL] Add support for tablegen includes and importing ODS information

This commit adds support for processing tablegen include files, and importing
various information from ODS. This includes operations, attribute+type constraints,
attribute/operation/type interfaces, etc. This will allow for much more robust tooling,
and also allows for referencing ODS constructs directly within PDLL (imported interfaces
can be used as constraints, operation result names can be used for member access, etc).

Differential Revision: https://reviews.llvm.org/D119900

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Add explicit `this->` to access method in attempt to fix gcc5 build (NFC)

Add explicit capture for `this` pointer in attempt to fix gcc5 build (NFC)

[mlir:PDLL] Add support for PDL MLIR code generation

This commits starts to plumb PDLL down into MLIR and adds an initial
PDL generator. After this commit, we will have conceptually support
end-to-e

[mlir:PDLL] Add support for PDL MLIR code generation

This commits starts to plumb PDLL down into MLIR and adds an initial
PDL generator. After this commit, we will have conceptually support
end-to-end execution of PDLL. Followups will add CPP generation to
match the current DRR setup, and begin to add various end-to-end
tests to test PDLL execution.

Differential Revision: https://reviews.llvm.org/D119779

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