[clang] [clang][Diagnostics] Highlight code snippets (PR #66514)

[Aaron Ballman via cfe-commits]

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================
@@ -53,6 +53,10 @@ LLVM_READNONE inline bool isASCII(int64_t c) { return 0 <= c 
&& c <= 127; }
 /// which is [a-zA-Z_].
 LLVM_READONLY inline bool isAsciiIdentifierStart(unsigned char c,
                                                  bool AllowDollar = false) {
+  if (!AllowDollar) {
+    return c == '_' || (c >= 'a' && c <= 'z') || (c >= 'A' && c <= 'Z');
+  }
+
----------------
AaronBallman wrote:

Why do we need this change?

https://github.com/llvm/llvm-project/pull/66514
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