MergeFunctions Pass, removed unused methods from old implementation.
    
Patch removed next old FunctionComparator methods:
    * enumerate
    * isEquivalentOperation
    * isEquivalentGEP
    * isEquivalentType 
    
This patch belongs to patch series that improves MergeFunctions
performance time from O(N*N) to O(N*log(N)).



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@211444 91177308-0d34-0410-b5e6-96231b3b80d8