[PATCH] ARM: When spilling extra registers for alignment, prefer low registers on all Thumb targets.

[Peter Collingbourne]

Hi t.p.northover,

This makes it more likely that we can use the 16-bit push and pop instructions
on Thumb-2, saving around 4 bytes per function.

http://reviews.llvm.org/D9165

Files:
  lib/Target/ARM/ARMFrameLowering.cpp
  test/CodeGen/ARM/2013-04-16-AAPCS-C5-vs-VFP.ll
  test/CodeGen/ARM/2013-05-02-AAPCS-ByVal-Structs-C4-C5-VFP.ll
  test/CodeGen/ARM/2013-05-02-AAPCS-ByVal-Structs-C4-C5-VFP2.ll
  test/CodeGen/ARM/debug-frame.ll
  test/CodeGen/ARM/fold-stack-adjust.ll
  test/CodeGen/ARM/interrupt-attr.ll
  test/CodeGen/Thumb2/2009-08-06-SpDecBug.ll
  test/CodeGen/Thumb2/large-stack.ll
  test/CodeGen/Thumb2/tpsoft.ll
  test/MC/ARM/elf-thumbfunc-reloc.ll

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