[PATCH] CodeGenPrepare: Avoid and/or i1 in select conditions.

[Matthias Braun]

Submit again (last time the patch/phabricator version got mixed up...):

This transforms
select(N0&N1, X, Y) => select(N0, select(N1, X, Y), Y)
select(N0|N1, X, Y) => select(N0, X, select(N1, X, Y))
for targets where performing and/or on i1 results implies using an
integer register for a compare result.

REPOSITORY
  rL LLVM

http://reviews.llvm.org/D7622

Files:
  include/llvm/Target/TargetLowering.h
  lib/CodeGen/CodeGenPrepare.cpp
  lib/Target/PowerPC/PPCISelLowering.h
  test/CodeGen/R600/or.ll
  test/CodeGen/X86/jump_sign.ll
  test/CodeGen/X86/zext-sext.ll
  test/Transforms/CodeGenPrepare/AArch64/select_and_or.ll
  test/Transforms/CodeGenPrepare/PowerPC/lit.local.cfg
  test/Transforms/CodeGenPrepare/PowerPC/select_and_or.ll
  test/Transforms/CodeGenPrepare/X86/select_and_or.ll

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