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

[via cfe-commits]

================
@@ -7810,9 +7813,11 @@ class Sema final : public SemaBase {
   }
 
   bool isInLifetimeExtendingContext() const {
-    assert(!ExprEvalContexts.empty() &&
----------------
yronglin wrote:

We check `isInLifetimeExtendingContext` when we create a 
`MaterializedTemporaryExpr`, if in a lifetime extend context, we will collect 
created MaterializedTemporaryExprs and extend its lifetime to a variable. 
e.g. (P2718R0 - Lifetime extension in range-based for loops.)In a for-range 
statement, we collect temporaries in for-range-init, and extend it's lifetime 
bound to for-range-var.

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