[PATCH] [X86][SSE] Keep 4i32 vector insertions in integer domain on pre-SSE4.1 targets

[Simon Pilgrim]

Hi chandlerc, andreadb,

4i32 shuffles for single insertions into zero vectors lowers to X86vzmovl was using movss - causing domain switch stalls. 

This patch fixes this by using movq( punpckldq $SRC, ZERO) ) instead.

Follow up to D6458 which dealt with SSE4.1 targets.

http://reviews.llvm.org/D6526

Files:
  lib/Target/X86/X86InstrSSE.td
  test/CodeGen/X86/uint_to_fp-2.ll
  test/CodeGen/X86/vector-shuffle-128-v4.ll
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