[MS ABI] Make member pointers return true for isIncompleteType

The type of a member pointer is incomplete if it has no inheritance
model.  This lets us reuse more general logic already embedded in clang.

llvm-svn: 247346

clang/lib/CodeGen/CodeGenFunction.cpp

@@ -117,7 +117,7 @@ CharUnits CodeGenFunction::getNaturalTypeAlignment(QualType T,
   if (Source) *Source = AlignmentSource::Type;
 
   CharUnits Alignment;
-  if (!CGM.getCXXABI().isTypeInfoCalculable(T)) {
+  if (T->isIncompleteType()) {
     Alignment = CharUnits::One(); // Shouldn't be used, but pessimistic is best.
   } else {
     // For C++ class pointees, we don't know whether we're pointing at a