[X86][SSE] Remove unnecessary -cpu from sttni tests

It was noticed on D47377 that these tests (for PR37246) were being unnecessarily affected by scheduler changes.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@333546 91177308-0d34-0410-b5e6-96231b3b80d8
1 file changed