[clang] [Clang][UBSan] Use EmitCheckedLValue for C++ trivial operator= operands (PR #203737)

[Hubert Tong via cfe-commits]

================
@@ -307,17 +312,22 @@ RValue 
CodeGenFunction::EmitCXXMemberOrOperatorMemberCallExpr(
   }
 
   if (TrivialForCodegen) {
-    if (isa<CXXDestructorDecl>(MD))
+    if (isa<CXXDestructorDecl>(MD)) {
+      (void)getLValueForThis(); // Emit LHS for side effects.
----------------
hubert-reinterpretcast wrote:

This merely maintains the status quo.

https://github.com/llvm/llvm-project/pull/203737
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