[ORC][C-bindings] Re-order object transform function arguments.

ObjInOut is an in-out parameter not a return value argument, so by convention
it should come after the context value (Ctx).

llvm/examples/OrcV2Examples/OrcV2CBindingsDumpObjects/OrcV2CBindingsDumpObjects.c

@@ -51,7 +51,7 @@ LLVMOrcThreadSafeModuleRef createDemoModule() {
   return TSM;
 }
 
-LLVMErrorRef dumpObjectsTransform(LLVMMemoryBufferRef *ObjInOut, void *Ctx) {
+LLVMErrorRef dumpObjectsTransform(void *Ctx, LLVMMemoryBufferRef *ObjInOut) {
   LLVMOrcDumpObjectsRef DumpObjects = *(LLVMOrcDumpObjectsRef *)Ctx;
   return LLVMOrcDumpObjects_CallOperator(DumpObjects, ObjInOut);
 }

llvm/include/llvm-c/Orc.h

@@ -328,7 +328,7 @@ typedef struct LLVMOrcOpaqueObjectTransformLayer
  * buffer should be disposed of and set to null.
  */
 typedef LLVMErrorRef (*LLVMOrcObjectTransformLayerTransformFunction)(
-    LLVMMemoryBufferRef *ObjInOut, void *Ctx);
+    void *Ctx, LLVMMemoryBufferRef *ObjInOut);
 
 /**
  * A reference to an orc::DumpObjects object.

llvm/lib/ExecutionEngine/Orc/OrcV2CBindings.cpp

@@ -524,7 +524,7 @@ void LLVMOrcObjectTransformLayerSetTransform(
       ->setTransform([TransformFunction, Ctx](std::unique_ptr<MemoryBuffer> Obj)
                          -> Expected<std::unique_ptr<MemoryBuffer>> {
         LLVMMemoryBufferRef ObjBuffer = wrap(Obj.release());
-        if (LLVMErrorRef Err = TransformFunction(&ObjBuffer, Ctx)) {
+        if (LLVMErrorRef Err = TransformFunction(Ctx, &ObjBuffer)) {
           assert(!ObjBuffer && "ObjBuffer was not reset to null on error");
           return unwrap(Err);
         }