Prune RelocVisitor.h include to avoid including COFF.h from MCJIT.h

This helps to mitigate the conflict between COFF.h and winnt.h, which is
PR28399.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@274637 91177308-0d34-0410-b5e6-96231b3b80d8
5 files changed