Remove triple from this test, it makes it fail when X86 TTI is missing.

Without a triple opt falls back to NoTTI which comes closer to LSR's pre-TTI behavior.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@172609 91177308-0d34-0410-b5e6-96231b3b80d8