[clang] Perf/lexer faster slow get char and size (PR #70543)

[via cfe-commits]

================
@@ -2085,8 +2093,9 @@ const char *Lexer::LexUDSuffix(Token &Result, const char *CurPtr,
       unsigned Consumed = Size;
       unsigned Chars = 1;
       while (true) {
-        unsigned NextSize;
-        char Next = getCharAndSizeNoWarn(CurPtr + Consumed, NextSize, LangOpts);
+        auto NextCharAndSize =
----------------
cor3ntin wrote:

Structured binding here?

https://github.com/llvm/llvm-project/pull/70543