Remove redundant test.

This is tested from MC already.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@204491 91177308-0d34-0410-b5e6-96231b3b80d8
R600/SI: Move instruction patterns to scalar versions.

Some of them also had the pattern on both, so this removes the
duplication.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@204492 91177308-0d34-0410-b5e6-96231b3b80d8