Remove some useless declarations (found by scan-build)

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@185752 91177308-0d34-0410-b5e6-96231b3b80d8
Objective-C: Warn when fast enumeration variable isn't used.
// rdar://14182680.


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@185762 91177308-0d34-0410-b5e6-96231b3b80d8
Fixed source location info for UnaryTransformTypeLoc nodes.


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@185765 91177308-0d34-0410-b5e6-96231b3b80d8