[llvm-commits] patch: preserve branch to unreachable until codegenprep time

[Nick Lewycky]

This patch moves the code that optimizes "branch to unreachable" from 
SimplifyCFG to CodeGenPrep. Most of this patch is just updating the unit 
tests that use unreachable everywhere. I've done my best to preserve the 
intent of the tests.

There's a tiny tweak to InlineCost but I think more work there is 
deserved. I'd rather wait until this lands before twiddling that further.

This implements http://nondot.org/sabre/LLVMNotes/BuiltinUnreachable.txt

Please review!

Nick
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