[PATCH] optimize merging of scalar loads for 32-byte vectors [X86, AVX] (PR21710)

[Sanjay Patel]

Hi Simon -

Updated test file to include a run for a machine with slow 32-byte mem accesses (currently that's just SandyBridge / IvyBridge), but I've used the target attributes directly to make the difference explicit.

http://reviews.llvm.org/D6536

Files:
  lib/Target/X86/X86ISelLowering.cpp
  test/CodeGen/X86/vec_loadsingles.ll
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