Fix layering by moving Support/CodeGenCWrappers.h to Target

This includes llvm-c/TargetMachine.h which is logically part of
libTarget (since libTarget implements llvm-c/TargetMachine.h's
functions).

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@328394 91177308-0d34-0410-b5e6-96231b3b80d8
3 files changed