[X86] Prefer blendps over insertps codegen for one special case

[X86] Prefer blendps over insertps codegen for one special case

With this patch, for this one exact case, we'll generate:

  blendps %xmm0, %xmm1, $1

instead of:

  insertps %xmm0, %xmm1, $0

If there's a memory operand available for load folding and we're
optimizing for size, we'll still generate the insertps.

The detailed performance data motivation for this may be found in D7866;
in summary, blendps has 2-3x throughput vs. insertps on widely used chips.

Differential Revision: http://reviews.llvm.org/D8332

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@232850 91177308-0d34-0410-b5e6-96231b3b80d8