[clang] Reapply "[Clang][CWG1815] Support lifetime extension of temporary created by aggregate initialization using a default member initializer" (PR #97308)

[via cfe-commits]

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@@ -6298,6 +6298,15 @@ class Sema final : public SemaBase {
 
   using ImmediateInvocationCandidate = llvm::PointerIntPair<ConstantExpr *, 1>;
 
+  enum class LifetimeExtendingContext {
+    None,       // Not in a lifetime extending context.
+    FlagOnly,   // A flag indicating whether we are in lifetime extending
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yronglin wrote:

Yeah, that's seems confused. I've add a new `RebuildDefaultArgOrDefaultInit`, 
WDYT?

https://github.com/llvm/llvm-project/pull/97308
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