[PATCH] [TargetInstrInfo] Add new hook: AnalyzeBranchPredicate.

[Sanjoy Das]

Hi atrick, reames,

NFC: no one uses AnalyzeBranchPredicate yet.

Add TargetInstrInfo::AnalyzeBranchPredicate and implement for x86.  A
later change adding support for page-fault based implicit null checks
depends on this.

http://reviews.llvm.org/D10200

Files:
  include/llvm/Target/TargetInstrInfo.h
  lib/Target/X86/X86InstrInfo.cpp
  lib/Target/X86/X86InstrInfo.h

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