[PATCH] ARMLoadStoreOpt: Merge subs/adds into LDRD/STRD; Factor out common code

[Matthias Braun]

Hi rengolin, jmolloy, mroth, charlieturner7c5,

This commit factors out common code from MergeBaseUpdateLoadStore() and
MergeBaseUpdateLSMultiple() and introduces a new function
MergeBaseUpdateLSDouble() which merges adds/subs preceding/following a
strd/ldrd instruction into an strd/ldrd instruction with writeback.

This requires http://reviews.llvm.org/D10623

REPOSITORY
  rL LLVM

http://reviews.llvm.org/D10676

Files:
  lib/Target/ARM/ARMLoadStoreOptimizer.cpp
  test/CodeGen/ARM/ldrd.ll

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