[PATCH] Adding TableGen patterns to auto-select TBM instructions

[Yunzhong Gao]

  I did not figure out how to use just patterns to express
  "i32 (trunc i64imm:$cntl)", so I defined a new instruction for that purpose.

  And fixed the patterns for BLCI to use "not (add $src, 1)" instead of
  "sub -2, $src".

http://llvm-reviews.chandlerc.com/D1788

CHANGE SINCE LAST DIFF
  http://llvm-reviews.chandlerc.com/D1788?vs=4562&id=4587#toc

Files:
  lib/Target/X86/X86InstrInfo.td
  lib/Target/X86/X86ISelLowering.cpp
  test/CodeGen/X86/tbm_patterns.ll
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