[clang] [clang] Deduplicate the logic that only warns once when stack is almost full (PR #112371)

[Chuanqi Xu via cfe-commits]

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@@ -1183,7 +1181,7 @@ class Sema final : public SemaBase {
   std::optional<std::unique_ptr<DarwinSDKInfo>> CachedDarwinSDKInfo;
   bool WarnedDarwinSDKInfoMissing = false;
 
-  bool WarnedStackExhausted = false;
+  SingleWarningStackAwareExecutor StackAwareExecutor;
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ChuanqiXu9 wrote:

Abstractly, we can generate codes without constructing a Sema by loading the AST file by ASTUnit and generate it. So I'd like to make them seperate.

https://github.com/llvm/llvm-project/pull/112371