[x86] Switch some of the new consolidated vector tests to use
a bare-metal triple and have nice BB labels, etc.

No significant change here, just tidying up to have a consistent set of
OS-agnostic vector functionality here.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@218854 91177308-0d34-0410-b5e6-96231b3b80d8