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

[via cfe-commits]

================
@@ -6291,9 +6291,19 @@ ExprResult Sema::BuildCXXDefaultArgExpr(SourceLocation CallLoc,
     ImmediateCallVisitor V(getASTContext());
     if (!NestedDefaultChecking)
       V.TraverseDecl(Param);
-    if (V.HasImmediateCalls) {
-      ExprEvalContexts.back().DelayedDefaultInitializationContext = {
-          CallLoc, Param, CurContext};
+
+    // Rewrite the call argument that was created from the corresponding
+    // parameter's default argument.
+    if (V.HasImmediateCalls || IsInLifetimeExtendingContext) {
+      if (V.HasImmediateCalls)
+        ExprEvalContexts.back().DelayedDefaultInitializationContext = {
+            CallLoc, Param, CurContext};
+      // Pass down lifetime extending flag, and collect temporaries in
+      // CreateMaterializeTemporaryExpr when we rewrite the call argument.
+      auto &LastRecord = ExprEvalContexts.back();
+      auto &PrevRecord = ExprEvalContexts[ExprEvalContexts.size() - 2];
+      LastRecord.IsInLifetimeExtendingContext = IsInLifetimeExtendingContext;
+
----------------
cor3ntin wrote:

We probably should do the same thing for `BuildCXXDefaultInitExpr`, right?

```cpp

struct my_range {
  // ...
  foo bar = temp();
};

for(elem : my_range {}) {}
```

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