Use DenseMap instead std::map for GVSummaryMapTy
Use DenseMap instead std::map for GVSummaryMapTy

Summary: Frontend change for https://reviews.llvm.org/D35148

Reviewers: tejohnson

Reviewed By: tejohnson

Subscribers: sanjoy, cfe-commits

Differential Revision: https://reviews.llvm.org/D35153

git-svn-id: ffe668792ed300d6c2daa1f6eba2e0aa28d7ec6c@307584 91177308-0d34-0410-b5e6-96231b3b80d8

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