[PATCH] D22083: Revert "[X86]: Improve Liveness checking for X86FixupBWInsts.cpp"

[Matthias Braun via llvm-commits]

MatzeB created this revision.
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This reverts commits r272797 and r272835.

I believe the improvements of these commits are merely workarounds for the
broken behaviour of the BranchFolder which I believe to have fixed in
http://reviews.llvm.org/D22027, so this should no longer be necessary.

The goal here is to make codegen independent of the presence of kill
flags which means we have to avoid LivePhysRegs::stepForward() calls
(among other things).

Repository:
  rL LLVM

http://reviews.llvm.org/D22083

Files:
  lib/Target/X86/X86FixupBWInsts.cpp
  test/CodeGen/X86/fixup-bw-inst-fwlive.mir

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