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

[Kevin B. Smith]

Seems like for the unit test that it would be better to not be quite so specific.  For the JUMPY case, maybe
CHECK-DAG: jl
CHECK-DAG: je
would be better, and a little less fragile because it seems like the ordering of the jumps could be arbitrary.
For the NOJMP case, maybe just check for one set, the or, and then a je or jne?


http://reviews.llvm.org/D10846

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