Fix crash if StmtProfile finds a type-dependent member access for which we have

Fix crash if StmtProfile finds a type-dependent member access for which we have
resolved the -> to a call to a specific operator-> function. The particular
test case added here is actually being mishandled: the implicit member access
should not be type-dependent (because it's accessing a non-type-dependent
member of the current instantiation), but calls to a type-dependent operator->
that is a member of the current instantiation would be liable to hit the same
codepath.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@284999 91177308-0d34-0410-b5e6-96231b3b80d8