[PATCH] D25000: [SCEV] Use a SmallPtrSet as a temporary union predicate; NFC

[Sanjoy Das via llvm-commits]

sanjoy created this revision.
sanjoy added reviewers: silviu.baranga, sbaranga.
sanjoy added a subscriber: llvm-commits.
Herald added subscribers: mzolotukhin, mcrosier, sanjoy.

Instead of creating and destroying SCEVUnionPredicate instances (which
internally creates and destroys a DenseMap), use temporary SmallPtrSet
instances of remember the set of predicates that will get reified into a
SCEVUnionPredicate.

https://reviews.llvm.org/D25000

Files:
  include/llvm/Analysis/ScalarEvolution.h
  lib/Analysis/ScalarEvolution.cpp

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