[clang] Reapply "[Clang][CWG1815] Support lifetime extension of temporary created by aggregate initialization using a default member initializer" (PR #108039)

[Erich Keane via cfe-commits]

================
@@ -2509,8 +2509,9 @@ Parser::DeclGroupPtrTy 
Parser::ParseDeclGroup(ParsingDeclSpec &DS,
 
       // P2718R0 - Lifetime extension in range-based for loops.
       if (getLangOpts().CPlusPlus23) {
-        auto &LastRecord = Actions.ExprEvalContexts.back();
+        auto &LastRecord = Actions.currentEvaluationContext();
         LastRecord.InLifetimeExtendingContext = true;
+        LastRecord.RebuildDefaultArgOrDefaultInit = true;
----------------
erichkeane wrote:

I guess I'm concerned that it is being set conditionally here, rather than 
above the loop?  Or is the more general case set somewhere else that isn't 
clear to me?

https://github.com/llvm/llvm-project/pull/108039
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