[PATCH] D100975: [AsmParser][SystemZ][z/OS] Reject "Dot" as current PC on z/OS

[Anirudh Prasad via Phabricator via llvm-commits]

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- Currently, the "." (Dot) character, when not identifying an Identifier or a Constant, refers to the current PC (Program Counter)
- However, in z/OS, for the HLASM dialect, it strictly accepts only the "*" as the current PC (Support for this will be put up in a follow-up patch)
- The changes in this patch allow individual platforms to choose whether they would like to use the "." (Dot) character as a marker for the current PC or not.
- It is achieved by introducing a new field in MCAsmInfo.h called `DotIsPC` (similar to `DollarIsPC`)


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D100975

Files:
  llvm/include/llvm/MC/MCAsmInfo.h
  llvm/lib/MC/MCParser/AsmParser.cpp
  llvm/lib/Target/SystemZ/MCTargetDesc/SystemZMCAsmInfo.cpp
  llvm/unittests/MC/SystemZ/SystemZAsmLexerTest.cpp

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