In LookupResult::resolveKind(), when handling multiple found declarations, ignore invalid declarations.

This reduces the "ambiguous reference" errors (which are rather strange in C/ObjC) and fixes an assertion hit
with an invalid code test case.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@175869 91177308-0d34-0410-b5e6-96231b3b80d8
3 files changed