Handle offsets larger than 32 bits.

David Majnemer noticed that it was not obvious what the behavior would
be if B.Offset - A.Offset could not fit in an int.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@257803 91177308-0d34-0410-b5e6-96231b3b80d8
1 file changed