Fix the clang part of PR7952: rewrite the specialization of isa<> in DeclBase,
and stop abusing the multi-level dereference isa<> used to allow.



git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@131804 91177308-0d34-0410-b5e6-96231b3b80d8
3 files changed