[PATCH] [ARM] Improve handling of stack accesses in Thumb-1.

[John Brawn]

New patch with test failures fixed. Some test failures were due to the load/store optimizer not understanding the AddrModeT1_s loads/stores, so it now does understand them, but an annoyingly large amount were due to tests needing adjustment due to different codegen. The widening of loads also now only happens little-endian, and not in thumb2 as then we have other instructions with more flexible addressing.


REPOSITORY
  rL LLVM

http://reviews.llvm.org/D7594

Files:
  lib/Target/ARM/ARMBaseRegisterInfo.cpp
  lib/Target/ARM/ARMISelDAGToDAG.cpp
  lib/Target/ARM/ARMInstrThumb.td
  lib/Target/ARM/ARMLoadStoreOptimizer.cpp
  test/CodeGen/ARM/2015-01-21-thumbv4t-ldstr-opt.ll
  test/CodeGen/ARM/atomic-ops-v8.ll
  test/CodeGen/ARM/debug-frame-vararg.ll
  test/CodeGen/ARM/frame-register.ll
  test/CodeGen/ARM/thumb1-varalloc.ll
  test/CodeGen/ARM/thumb1_return_sequence.ll
  test/CodeGen/Thumb/stack-access.ll
  test/CodeGen/Thumb/stm-merge.ll
  test/CodeGen/Thumb/vargs.ll

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