[PATCH] add a cl::opt override for TargetLowering's JumpIsExpensive

[Sanjay Patel]

Hi hfinkel, chandlerc,

This patch is not intended to change existing codegen behavior for any target. It just exposes the JumpIsExpensive setting on the command-line to allow for easier testing and emergency overrides.

Also, change the existing regression test to use FileCheck, explicitly specify the jump-is-expensive option, and use more precise checks.

http://reviews.llvm.org/D10846

Files:
  include/llvm/Target/TargetLowering.h
  lib/CodeGen/TargetLoweringBase.cpp
  test/CodeGen/X86/or-branch.ll

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