[K/N] Add ObjCARCContract LLVM pass.

kotlin-native/llvmCoverageMappingC/src/main/cpp/CoverageMappingC.cpp

@@ -19,8 +19,10 @@
 #include <llvm/IR/LegacyPassManager.h>
 #include <llvm/Analysis/TargetLibraryInfo.h>
 #include <llvm/Transforms/Instrumentation.h>
+#include <llvm/Transforms/ObjCARC.h>
 #include <llvm/Support/FileSystem.h>
 #include <llvm/Support/Path.h>
+
 #include <utility>
 #include <string>
 #include <vector>
@@ -230,6 +232,11 @@ void LLVMKotlinAddTargetLibraryInfoWrapperPass(LLVMPassManagerRef passManagerRef
   passManager->add(new TargetLibraryInfoWrapperPass(Triple(targetTriple)));
 }
 
+void LLVMAddObjCARCContractPass(LLVMPassManagerRef passManagerRef) {
+    legacy::PassManagerBase *passManager = unwrap(passManagerRef);
+    passManager->add(createObjCARCContractPass());
+}
+
 void LLVMKotlinInitializeTargets() {
 #define INIT_LLVM_TARGET(TargetName) \
     LLVMInitialize##TargetName##TargetInfo();\

kotlin-native/llvmCoverageMappingC/src/main/include/CoverageMappingC.h

@@ -74,6 +74,8 @@ void LLVMAddInstrProfPass(LLVMPassManagerRef passManagerRef, const char* outputF
 
 void LLVMKotlinAddTargetLibraryInfoWrapperPass(LLVMPassManagerRef passManagerRef, const char* targetTriple);
 
+void LLVMAddObjCARCContractPass(LLVMPassManagerRef passManagerRef);
+
 void LLVMKotlinInitializeTargets();
 
 # ifdef __cplusplus