[clang] [Clang][C23] Memoize typedef lookups for C23 auto disambiguation (PR #224019)

[Zahira Ammarguellat via cfe-commits]

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@@ -425,6 +425,11 @@ bool Parser::SkipUntil(ArrayRef<tok::TokenKind> Toks, SkipUntilFlags Flags) {
 //===----------------------------------------------------------------------===//
 
 void Parser::EnterScope(unsigned ScopeFlags) {
+  // Invalidate the typedef-name cache: an identifier may resolve differently
+  // in the new scope.
+  if (!IsTypedefNameCache.empty())
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zahiraam wrote:

Dropped the cache.

https://github.com/llvm/llvm-project/pull/224019