Revert r133024, "[format strings] correctly suggest correct type for '%@'

specifiers.  Fixes <rdar://problem/9607158>." because it causes false positives
on some code that uses CF toll free bridging.
 - I'll let Doug or Ted figure out the right fix here, possibly just to accept
   any pointer type.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@134041 91177308-0d34-0410-b5e6-96231b3b80d8