[Clang][AST] Fix HandleLValueBase to deal with references (#140105)
Since P2280R4 Unknown references and pointers was implemented,
HandleLValueBase now has to deal with referneces:
D.MostDerivedType->getAsCXXRecordDecl()
will return a nullptr if D.MostDerivedType is a ReferenceType. The fix
is to use getNonReferenceType() to obtain the Pointee Type if we have a
reference.
Fixes: https://github.com/llvm/llvm-project/issues/139452
(cherry picked from commit 136f2ba2a7bca015ef831c91fb0db5e5e31b7632)
# Conflicts:
# clang/docs/ReleaseNotes.rst