[mlir][Parser] Fix memory leak when failing to parse a forward declared block

This commit fixes a failure edge case where we accidentally drop forward
declared blocks in the error case. This allows

[mlir][Parser] Fix memory leak when failing to parse a forward declared block

This commit fixes a failure edge case where we accidentally drop forward
declared blocks in the error case. This allows for running the
invalid.mlir test in asan mode now.

Fixes #51387

Differential Revision: https://reviews.llvm.org/D130132

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[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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