[PATCH] [AArch64] Add register spill code for large super registers such as DPair, DTriple ...

[Hao Liu]

Hi t.p.northover,

Hi Tim and reviewers,

Currently we don't have spill code for large super registers (DPair, DTriple, DQuad, QPair, QTriple, QQuad) in storeRegToStackSlot() and loadRegFromStackSlot(). So when we need to spill such registers, the compiler will fail. 

This patch fixes such problems by adding corresponding vector load/store. As vector load/store can't have an offset operand, if the offset to frame is not zeor, it will always add frame and offset to a register first.

Review please.

Thanks,
-Hao

http://llvm-reviews.chandlerc.com/D2438

Files:
  lib/Target/AArch64/AArch64InstrInfo.cpp
  lib/Target/AArch64/AArch64RegisterInfo.cpp
  test/CodeGen/AArch64/neon-vector-list-spill.ll
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