Chandler Carruth 6accb77bd2 [GMR] Switch from std::set to SmallPtrSet. NFC.
This almost certainly doesn't matter in some deep sense, but std::set is
essentially always going to be slower here. Now the alias query should
be essentially constant time instead of having to chase the set tree
each time.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@242893 91177308-0d34-0410-b5e6-96231b3b80d8
2015-07-22 11:47:54 +00:00
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