[PATCH] D22845: Rework CFG simplification in bugpoint

[Daniel Berlin via llvm-commits]

dberlin created this revision.
dberlin added reviewers: chandlerc, majnemer.
dberlin added a subscriber: llvm-commits.
dberlin added a dependency: D22841: Add a pass to bugpoint to make it transform conditional jumps into unconditional jumps..

Depends on D22841

We now use a much simpler CFG simplification routine for bugpoint,
because SimplifyCFG is no longer a good match for what bugpoint wants
to do.

At the same time, to make sure we don't lose anything valuable it was doing,
SimplifyCFG is now run as a per-BB reduction pass.

With this and D22841 combined, bugpoint operates both much faster on
the large testcases i have, and reduces them to pretty much minimal
testcases (in one case, bugpoint used to leave about 6000 useless blocks, and
now it leaves 3 ...)

https://reviews.llvm.org/D22845

Files:
  tools/bugpoint/CrashDebugger.cpp

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