The case when the bound variable is reference type in a
BindingDecl wasn't handled, which lead to false positives.
Differential Revision: https://reviews.llvm.org/D128716
clang/test/lit.cfg.py doesn't list .cc as test extension, so these
tests never ran.
Tweak one of the two tests to actually pass, now that it runs.
(The other one was already passing.)
llvm-svn: 367574