Chandler Carruth 9233137390 [Unroll] Refactor the accumulation of optimized instruction costs into
a single location.

This reduces code duplication a bit and will also pave the way for
a better separation between the visitation algorithm and the unroll
analysis.

No functionality changed.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@237990 91177308-0d34-0410-b5e6-96231b3b80d8
2015-05-22 02:47:29 +00:00
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