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Commit 3dbe1050 authored by Duncan P. N. Exon Smith's avatar Duncan P. N. Exon Smith
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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
parent 936aef92
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