passes.add(createCFGSimplificationPass());
passes.add(createEarlyCSEPass());
passes.add(createInstructionCombiningPass());
+#if LLVM_VERSION_MAJOR <= 11
passes.add(createConstantPropagationPass());
+#endif
passes.add(createSCCPPass());
passes.add(createAggressiveDCEPass());