MergeFunctions Pass, removed DenseMap helpers.

Patch removes rest part of code related to old implementation.

This patch belongs to patch series that improves MergeFunctions
performance time from O(N*N) to O(N*log(N)).

This one was the final patch.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@211457 91177308-0d34-0410-b5e6-96231b3b80d8