[llvm-commits] PATCH: Add pass printing and a basic sanity test for BlockFrequencyInfo analysis

[Chandler Carruth]

Hello,

So it turns out that BranchProbabilityInfo and BlockFrequencyInfo aren't
rigged up to __builtin_expect at all. I think no one realized because we
have essentially no test coverage for these analysis passes. See
http://llvm.org/PR2577

This patch adds test coverage for BlockFrequencyInfo which is the easiest to
test, and essentially a good way to strictly cover BranchProbabilityInfo.
Subsequent patches to add the remaining features to actually use
__builtin_expect will follow with tests based on this.
-Chandler
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