[Sema] Make typeof(OverloadedFunctionName) not a pointer.

[Sema] Make typeof(OverloadedFunctionName) not a pointer.

We were sometimes doing a function->pointer conversion in
Sema::CheckPlaceholderExpr, which isn't the job of CheckPlaceholderExpr.

So, when we saw typeof(OverloadedFunctionName), where
OverloadedFunctionName referenced a name with only one function that
could have its address taken, we'd give back a function pointer type
instead of a function type. This is incorrect.

I kept the logic for doing the function pointer conversion in
resolveAndFixAddressOfOnlyViableOverloadCandidate because it was more
consistent with existing ResolveAndFix* methods.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@302506 91177308-0d34-0410-b5e6-96231b3b80d8