[PATCH] Avoid combining adjacent stores at -O0 to improve debug experience

[Paul Robinson]

Hi echristo, dblaikie,

When the source has a series of assignments, users reasonably want to
have the debugger step through each one individually. Turn off the combine
for adjacent stores so we get this behavior at -O0.

http://reviews.llvm.org/D7181

Files:
  lib/CodeGen/SelectionDAG/DAGCombiner.cpp
  test/CodeGen/X86/dbg-combine.ll

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