[examples][ORC] Add missing call to LLVMDisposeBuilder to example.

The missing call was pointed out in https://llvm.org/PR56953, though it's not
the focus of that issue.

Author: lhames

llvm/examples/OrcV2Examples/OrcV2CBindingsIRTransforms/OrcV2CBindingsIRTransforms.c

@@ -47,6 +47,7 @@ LLVMOrcThreadSafeModuleRef createDemoModule(void) {
   LLVMValueRef SumArg1 = LLVMGetParam(SumFunction, 1);
   LLVMValueRef Result = LLVMBuildAdd(Builder, SumArg0, SumArg1, "result");
   LLVMBuildRet(Builder, Result);
+  LLVMDisposeBuilder(Builder);
   LLVMOrcThreadSafeModuleRef TSM = LLVMOrcCreateNewThreadSafeModule(M, TSCtx);
   LLVMOrcDisposeThreadSafeContext(TSCtx);
   return TSM;