[PATCH] D19245: [SimplifyCFG] Fold `llvm.guard(false)` to unreachable

[Sanjoy Das via llvm-commits]

sanjoy created this revision.
sanjoy added reviewers: hfinkel, pcc.
sanjoy added a subscriber: llvm-commits.
Herald added a subscriber: mcrosier.

`llvm.guard(false)` always bails out of the current compilation unit, so
we can prune any control flow following it.

Note: earlier I had submitted an incorrect version of this change as
D19188.

http://reviews.llvm.org/D19245

Files:
  include/llvm/Transforms/Utils/Local.h
  lib/Transforms/Utils/Local.cpp
  test/Transforms/SimplifyCFG/guards.ll

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