[LLVM-C] Expose the "Add Discriminators" Pass To LLVM-C

[CodaFi]

Summary

Add bindings to create a wrapped "Add Discriminators" pass. Now that we have debug info support, this is a handy transform to have.

[whitequark]

LGTM

llvm/include/llvm-c/Transforms/Utils.h

  */
 
 /** See llvm::createLowerSwitchPass function. */
 void LLVMAddLowerSwitchPass(LLVMPassManagerRef PM);
 
 /** See llvm::createPromoteMemoryToRegisterPass function. */
 void LLVMAddPromoteMemoryToRegisterPass(LLVMPassManagerRef PM);
 
+/** See llvm::createAddDiscriminatorsPass function. */
+void LLVMAddAddDiscriminatorsPass(LLVMPassManagerRef PM);
+
 /**
  * @}
  */
 
 #ifdef __cplusplus
 }
 #endif /* defined(__cplusplus) */
 
 #endif
 

llvm/lib/Transforms/Utils/Utils.cpp

 void LLVMAddLowerSwitchPass(LLVMPassManagerRef PM) {
   unwrap(PM)->add(createLowerSwitchPass());
 }
 
 void LLVMAddPromoteMemoryToRegisterPass(LLVMPassManagerRef PM) {
   unwrap(PM)->add(createPromoteMemoryToRegisterPass());
 }
 
+void LLVMAddAddDiscriminatorsPass(LLVMPassManagerRef PM) {
+  unwrap(PM)->add(createAddDiscriminatorsPass());
+}