[clang] [clang][Sema] Track trivial-relocatability as a type trait (PR #84621)

[via cfe-commits]

================
@@ -857,8 +881,13 @@ void CXXRecordDecl::addedMember(Decl *D) {
         data().HasDeclaredCopyAssignmentWithConstParam = true;
     }
 
-    if (Method->isMoveAssignmentOperator())
+    if (Method->isMoveAssignmentOperator()) {
       SMKind |= SMF_MoveAssignment;
+    }
+
+    if (Method->isUserProvided() &&
+        (Method->isCopyAssignment() || Method->isMoveAssignment()))
+      data().IsNaturallyTriviallyRelocatable = false;
----------------
cor3ntin wrote:

If we stick to the 2786r4 definition, this is overly restrictive (ie assignment 
does not affect relocatability)

https://github.com/llvm/llvm-project/pull/84621
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