[PATCH] D99277: [AsmParser][SystemZ][z/OS] Add in support to accept "#" as part of an Identifier token

[Anirudh Prasad via Phabricator via llvm-commits]

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- This patch adds in support to accept the "#" character as part of an Identifier.
- This support is needed especially for the HLASM dialect since "#" is treated as part of the valid "Alphabet" range
- The way this is done is by making use of the previous precedent set by the `AllowAtInIdentifier` field in `MCAsmLexer.h`. A new field called `AllowHashInIdentifier` is introduced.
- The static function `IsIdentifierChar` is also updated to accept the `#` character if the `AllowHashInIdentifier` field is set to true.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D99277

Files:
  llvm/include/llvm/MC/MCParser/MCAsmLexer.h
  llvm/lib/MC/MCParser/AsmLexer.cpp
  llvm/unittests/MC/SystemZ/SystemZAsmLexerTest.cpp

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