[llvm] [MCParser] Deduplicate isIdentifierChar. (#218100) (PR #218851)

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``````````bash
git-clang-format --diff origin/main HEAD --extensions h,cpp -- llvm/include/llvm/MC/MCParser/AsmLexer.h llvm/lib/MC/MCParser/AsmLexer.cpp llvm/lib/MC/MCParser/AsmParser.cpp --diff_from_common_commit
``````````

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View the diff from clang-format here.
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``````````diff
diff --git a/llvm/include/llvm/MC/MCParser/AsmLexer.h b/llvm/include/llvm/MC/MCParser/AsmLexer.h
index 6b7cdb8d7..2cd9a0f43 100644
--- a/llvm/include/llvm/MC/MCParser/AsmLexer.h
+++ b/llvm/include/llvm/MC/MCParser/AsmLexer.h
@@ -132,8 +132,8 @@ public:
   }
 
   /// LexIdentifier: [a-zA-Z_$.@?][a-zA-Z0-9_$.@#?]*
-  static LLVM_ATTRIBUTE_ALWAYS_INLINE
-  bool isIdentifierChar(char C, bool AllowAt = false, bool AllowHash = false) {
+  static LLVM_ATTRIBUTE_ALWAYS_INLINE bool
+  isIdentifierChar(char C, bool AllowAt = false, bool AllowHash = false) {
     return llvm::isAlnum(C) || C == '_' || C == '$' || C == '.' || C == '?' ||
            (AllowAt && C == '@') || (AllowHash && C == '#');
   }

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https://github.com/llvm/llvm-project/pull/218851