[clang] [Clang] Implement P2718R0 "Lifetime extension in range-based for loops" (PR #76361)

[Aaron Ballman via cfe-commits]

================
@@ -6305,6 +6315,10 @@ ExprResult Sema::BuildCXXDefaultArgExpr(SourceLocation CallLoc,
       if (Res.isInvalid())
         return ExprError();
       Init = Res.get();
+
+      // Collect MaterializeTemporaryExprs in the rewrited CXXDefaultArgExpr.
----------------
AaronBallman wrote:

```suggestion
      // Collect MaterializeTemporaryExprs in the rewritten CXXDefaultArgExpr.
```

https://github.com/llvm/llvm-project/pull/76361