[X86][SSE] Add non-uniform udiv test that is mostly divide by 1.

[X86][SSE] Add non-uniform udiv test that is mostly divide by 1.

The test demonstrates over-complicated codegen for a udiv that only has one divisor that doesn't equal 1. This should have allowed the codegen to be a lot simpler (uniform shifts etc.) but only the SSE2 manages to make use of this......

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@340313 91177308-0d34-0410-b5e6-96231b3b80d8