Reland: [clang] NFC: Clear some uses of MemberPointerType::getClass (#132317)

Relands Original PR: https://github.com/llvm/llvm-project/pull/131965
Addresses
https://github.com/llvm/llvm-project/pull/131965#issuecomment-2741619498
* Fixes isIncompleteType for injected classes

This clears up some uses of getClass on MemberPointerType when
equivalent uses of getMostRecentCXXRecordDecl would be just as simple or
simpler.
    
This is split-off from a larger patch which removes getClass, in order
to facilitate review.

1 files changed, 2 insertions, 5 deletions

diff --git a/clang/lib/Sema/SemaLookup.cpp b/clang/lib/Sema/SemaLookup.cpp
index aecf8ed..59dc6df 100644
--- a/clang/lib/Sema/SemaLookup.cpp
+++ b/clang/lib/Sema/SemaLookup.cpp
@@ -3210,11 +3210,8 @@ addAssociatedClassesAndNamespaces(AssociatedLookup &Result, QualType Ty) {
     //        X.
     case Type::MemberPointer: {
       const MemberPointerType *MemberPtr = cast<MemberPointerType>(T);
-
-      // Queue up the class type into which this points.
-      Queue.push_back(MemberPtr->getClass());
-
-      // And directly continue with the pointee type.
+      addAssociatedClassesAndNamespaces(
+          Result, MemberPtr->getMostRecentCXXRecordDecl());
       T = MemberPtr->getPointeeType().getTypePtr();
       continue;
     }