David Green 2557e437fd [UnJ] Use SmallPtrSets for block collections. NFC ...

We no longer care about the order of blocks in these collections,
so can change to SmallPtrSets, making contains checks quicker.

Differential revision: https://reviews.llvm.org/D49060

llvm-svn: 336897

2018-07-12 10:44:47 +00:00

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