[PATCH] Disable DAGCombine for -O0 and optnone

[Oleg Ranevskyy]

Corrections according to the remarks from Paul.
Fix for CodeGen/ARM/2010-05-18-LocalAllocCrash.ll crash (ARMISelDAGToDAG.cpp).


REPOSITORY
  rL LLVM

http://reviews.llvm.org/D9992

Files:
  lib/CodeGen/SelectionDAG/DAGCombiner.cpp
  lib/Target/ARM/ARMISelDAGToDAG.cpp
  test/CodeGen/AArch64/aarch64_f16_be.ll
  test/CodeGen/AArch64/and-mask-removal.ll
  test/CodeGen/ARM/Windows/alloca.ll
  test/CodeGen/ARM/alloc-no-stack-realign.ll
  test/CodeGen/ARM/big-endian-ret-f64.ll
  test/CodeGen/ARM/vst3.ll
  test/CodeGen/X86/atomic16.ll
  test/CodeGen/X86/atomic32.ll
  test/CodeGen/X86/atomic6432.ll
  test/CodeGen/X86/dag-optnone.ll
  test/CodeGen/X86/fast-isel-gep.ll
  test/CodeGen/X86/inline-asm-tied.ll
  test/CodeGen/X86/musttail.ll
  test/CodeGen/X86/switch.ll
  test/CodeGen/X86/win32_sret.ll
  test/CodeGen/X86/win64_eh.ll
  test/CodeGen/XCore/threads.ll
  test/DebugInfo/ARM/line.test
  test/DebugInfo/X86/op_deref.ll
  test/DebugInfo/X86/vla.ll
  test/tools/llvm-symbolizer/ppc64.test

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