[PATCH] D137051: [Clang] Allow additional mathematical symbols in identifiers.

[Corentin Jabot via Phabricator via cfe-commits]

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Implement the proposed UAX Profile
"Mathematical notation profile for default identifiers".

This implements a not-yet approved Unicode for a vetted
UAX32 identifier profile
https://www.unicode.org/L2/L2022/22230-math-profile.pdf

This change mitigates the reported disruption caused
by the implementation of UAX32 in C++ and C2x,
as these mathematical symbols are commonly used in the
scientific community.

Fixes #54732


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D137051

Files:
  clang/docs/ReleaseNotes.rst
  clang/include/clang/Basic/DiagnosticLexKinds.td
  clang/lib/Lex/Lexer.cpp
  clang/lib/Lex/UnicodeCharSets.h
  clang/test/Driver/autocomplete.c
  clang/test/Lexer/unicode.c

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