Fix COFF section index relocation should be 16 bits, not 32

Original patch by Andrey Guskov!
http://reviews.llvm.org/D5651



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@219327 91177308-0d34-0410-b5e6-96231b3b80d8
7 files changed