[PATCH] Combining Load and IntToFp should check for neon availability

[Weiming Zhao]

otherwise, it will crash. (see the test case)

http://reviews.llvm.org/D6511

Files:
  lib/Target/AArch64/AArch64ISelLowering.cpp
  test/CodeGen/AArch64/aarch64-2014-12-02-combine-soften.ll
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