Fix incorrect test cases for srem. The definition of srem is a remainder so

Fix incorrect test cases for srem. The definition of srem is a remainder so
that the sign of the result follows the sign of the divisor.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@35301 91177308-0d34-0410-b5e6-96231b3b80d8