If an instance method messages is sending to an expression of type Class,

If an instance method messages is sending to an expression of type Class,
and we statically can compute a bound on the actual type (e.g.,
because it's a send to the the magic "class" instance method), code
complete as if we were performing a class message send to that class.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@118443 91177308-0d34-0410-b5e6-96231b3b80d8