[PATCH] ARM: Homogeneous aggregates must be allocated to contiguous registers (clang part)

[Oliver Stannard]

  The code which I removed from clang enforced two AACPS-VFP rules:
  * CPRCs cannot be split between registers and the stack
  * If anything has been allocated to the stack, large arguments cannot be split between GPRs and the stack

  My change to LLVM only covers the first case, so I have reverted the code in clang which fixes the second case. This means that the amount of code removed from clang is now small, but this set of patches still reduces the PCS knowledge embedded in the IR somewhat.

http://llvm-reviews.chandlerc.com/D3083

CHANGE SINCE LAST DIFF
  http://llvm-reviews.chandlerc.com/D3083?vs=7839&id=7938#toc

Files:
  lib/CodeGen/CGCall.cpp
  lib/CodeGen/TargetInfo.cpp
  test/CodeGen/arm-aapcs-vfp.c
  test/CodeGen/arm-homogenous.c
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