[clang] Don't wrap immediate invocations in ConstantExprs within constexpr initializers (PR #89565)

[via cfe-commits]

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@@ -2559,25 +2559,30 @@ Decl 
*Parser::ParseDeclarationAfterDeclaratorAndAttributes(
     Parser &P;
     Declarator &D;
     Decl *ThisDecl;
+    bool Entered;
 
     InitializerScopeRAII(Parser &P, Declarator &D, Decl *ThisDecl)
-        : P(P), D(D), ThisDecl(ThisDecl) {
+        : P(P), D(D), ThisDecl(ThisDecl), Entered(false) {
       if (ThisDecl && P.getLangOpts().CPlusPlus) {
         Scope *S = nullptr;
         if (D.getCXXScopeSpec().isSet()) {
           P.EnterScope(0);
           S = P.getCurScope();
         }
-        P.Actions.ActOnCXXEnterDeclInitializer(S, ThisDecl);
+        if (ThisDecl && !ThisDecl->isInvalidDecl()) {
+          P.Actions.ActOnCXXEnterDeclInitializer(S, ThisDecl);
+          Entered = true;
+        }
       }
     }
-    ~InitializerScopeRAII() { pop(); }
-    void pop() {
+    ~InitializerScopeRAII() {
----------------
cor3ntin wrote:

This is a nice improvement

https://github.com/llvm/llvm-project/pull/89565
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