[clang] [Clang] prevent setting default lexical access specifier for missing primary declarations (PR #112424)

[Oleksandr T. via cfe-commits]

================
@@ -39,7 +39,8 @@ bool Sema::SetMemberAccessSpecifier(NamedDecl *MemberDecl,
                                     AccessSpecifier LexicalAS) {
   if (!PrevMemberDecl) {
     // Use the lexical access specifier.
-    MemberDecl->setAccess(LexicalAS);
----------------
a-tarasyuk wrote:

@shafik could you take a look at the latest changes? thanks

https://github.com/llvm/llvm-project/pull/112424