[clang] Reland [clang] Handle instantiated members to determine visibility (#136128) (PR #136689)

[Erich Keane via cfe-commits]

================
@@ -4787,8 +4787,10 @@ LinkageInfo 
LinkageComputer::computeTypeLinkageInfo(const Type *T) {
     return computeTypeLinkageInfo(cast<ReferenceType>(T)->getPointeeType());
   case Type::MemberPointer: {
     const auto *MPT = cast<MemberPointerType>(T);
-    LinkageInfo LV =
-        getDeclLinkageAndVisibility(MPT->getMostRecentCXXRecordDecl());
+    LinkageInfo LV;
+    if (CXXRecordDecl *D = MPT->getMostRecentCXXRecordDecl()) {
----------------
erichkeane wrote:

```suggestion
    if (auto *D = MPT->getMostRecentCXXRecordDecl()) {
```

https://github.com/llvm/llvm-project/pull/136689
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