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

[Oleksandr T. via cfe-commits]

================
@@ -585,10 +585,11 @@ Bug Fixes to C++ Support
 - Clang incorrectly considered a class with an anonymous union member to not be
   const-default-constructible even if a union member has a default member initializer.
   (#GH95854).
-- Fixed an assertion failure when evaluating an invalid expression in an array initializer. (#GH112140)
+- Fixed an assertion failure when evaluating an invalid expression in an array initializer (#GH112140)
----------------
a-tarasyuk wrote:

@zyn0217 oops, it looks like it was removed during the merge conflict resolution. I've reverted it — thanks.

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