Revert "Revert r347596 "Support for inserting profile-directed cache prefetches""

Summary:
This reverts commit d8517b96dfbd42e6a8db33c50d1fa1e58e63fbb9.

Fix: correct  the use of DenseMap.

Reviewers: davidxl, hans, wmi

Reviewed By: wmi

Subscribers: mgorny, eraman, llvm-commits

Differential Revision: https://reviews.llvm.org/D55088

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@347938 91177308-0d34-0410-b5e6-96231b3b80d8
16 files changed