Don't produce duplicate notes if we have deduction failure notes when resolving
the address of an overloaded function template.


git-svn-id: http://llvm.org/svn/llvm-project/cfe/trunk@188334 91177308-0d34-0410-b5e6-96231b3b80d8
Refine diagnostics in my last patch.
// rdar://14303083


git-svn-id: http://llvm.org/svn/llvm-project/cfe/trunk@188335 91177308-0d34-0410-b5e6-96231b3b80d8