[clang] [llvm] [Clang][Lexer] Reland "Detect SSE4.2 availability at runtime in fastParseASCIIIdentifier" (PR #175452)

[Thibault Monnier via cfe-commits]

https://github.com/Thibault-Monnier edited 
https://github.com/llvm/llvm-project/pull/175452
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