Object, COFF: Fix some theoretical bugs

getObject didn't consider the case where a pointer came before the start
of the object file.  No test is included, trying to come up with
something reasonable.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@221868 91177308-0d34-0410-b5e6-96231b3b80d8
1 file changed