Revert "[IRSim] Adding IR Instruction Mapper"

This reverts commit b04c1a9.

Author: sstamenova

llvm/include/llvm/Analysis/IRSimilarityIdentifier.h

@@ -54,7 +54,6 @@ add_llvm_component_library(LLVMAnalysis
   GlobalsModRef.cpp
   GuardUtils.cpp
   HeatUtils.cpp
-  IRSimilarityIdentifier.cpp
   IVDescriptors.cpp
   IVUsers.cpp
   IndirectCallPromotionAnalysis.cpp