[mlir:Bytecode] Add encoding support for a majority of the builtin attributes

This adds support for the non-location, non-elements, non-affine
builtin attributes.

Differential Revision: https://rev

[mlir:Bytecode] Add encoding support for a majority of the builtin attributes

This adds support for the non-location, non-elements, non-affine
builtin attributes.

Differential Revision: https://reviews.llvm.org/D132539

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[mlir:Bytecode] Add initial support for dialect defined attribute/type encodings

Dialects can opt-in to providing custom encodings by implementing the
`BytecodeDialectInterface`. This interface prov

[mlir:Bytecode] Add initial support for dialect defined attribute/type encodings

Dialects can opt-in to providing custom encodings by implementing the
`BytecodeDialectInterface`. This interface provides hooks, namely
`readAttribute`/`readType` and `writeAttribute`/`writeType`, that will be used
by the bytecode reader and writer. These hooks are provided a reader and writer
implementation that can be used to encode various constructs in the underlying
bytecode format. A unique feature of this interface is that dialects may choose
to only encode a subset of their attributes and types in a custom bytecode
format, which can simplify adding new or experimental components that aren't
fully baked.

Differential Revision: https://reviews.llvm.org/D132498

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[mlir:Bytecode][NFC] Cleanup Attribute/Type reading

This moves some parsing functionality from BytecodeReader to
AttrTypeReader, and removes some duplication between the attribute/type
code paths.

[mlir:Bytecode][NFC] Cleanup Attribute/Type reading

This moves some parsing functionality from BytecodeReader to
AttrTypeReader, and removes some duplication between the attribute/type
code paths.

Differential Revision: https://reviews.llvm.org/D132497

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[mlir:Bytecode][NFC] Refactor string section writing and reading

This extracts the string section writer and reader into dedicated
classes, which better separates the logic and will also simplify fu

[mlir:Bytecode][NFC] Refactor string section writing and reading

This extracts the string section writer and reader into dedicated
classes, which better separates the logic and will also simplify future
patches that want to interact with the string section.

Differential Revision: https://reviews.llvm.org/D132496

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[mlir:Bytecode] Fix asan failure

We were accessing the region state after it got popped from the stack.

[mlir] Fix compile errors with bytecode support

[mlir] Fix bots after bytecode support was added in D131747

* Fix ambiguous Twine constructor call
* Ensure shift is 64-bit (for MSVC)
* Disable bytecode tests on s390x (we don't support big endian

[mlir] Fix bots after bytecode support was added in D131747

* Fix ambiguous Twine constructor call
* Ensure shift is 64-bit (for MSVC)
* Disable bytecode tests on s390x (we don't support big endian right now)

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[mlir] Add initial support for a binary serialization format

This commit adds a new bytecode serialization format for MLIR.
The actual serialization of MLIR to binary is relatively straightforward,

[mlir] Add initial support for a binary serialization format

This commit adds a new bytecode serialization format for MLIR.
The actual serialization of MLIR to binary is relatively straightforward,
given the very very general structure of MLIR. The underlying basis for
this format is a variable-length encoding for integers, which gets heavily
used for nearly all aspects of the encoding (given that most of the encoding
is just indexing into lists).

The format currently does not provide support for custom attribute/type
serialization, and thus always uses an assembly format fallback. It also
doesn't provide support for resources. These will be added in followups,
the intention for this patch is to provide something that supports the
basic cases, and can be built on top of.

https://discourse.llvm.org/t/rfc-a-binary-serialization-format-for-mlir/63518

Differential Revision: https://reviews.llvm.org/D131747

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