[PATCH] [X86] Make EltsFromConsecutiveLoads code path work only on vectors it expects

[Michael Kuperstein]

Hi spatel,

EltsFromConsecutiveLoads was apparently only ever called for 128-bit vectors, and assumed this implicitly. 
r223518 started calling it for AVX-sized vectors, causing the code path that had this assumption to crash. 

This makes the assumption explicit by adding a check.

http://reviews.llvm.org/D6579

Files:
  lib/Target/X86/X86ISelLowering.cpp
  test/CodeGen/X86/elts-from-loads-256.ll
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