Duncan P. N. Exon Smith 3dbe10503a blockfreq: Implement Pass::releaseMemory() ...

Implement Pass::releaseMemory() in BlockFrequencyInfo and
MachineBlockFrequencyInfo.  Just delete the private implementation when
not in use.  Switch to a std::unique_ptr to make the logic more clear.

<rdar://problem/14292693>

llvm-svn: 204741

2014-03-25 18:01:38 +00:00

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