[stubs] Unify the type conversion call interface descriptors.

src/code-stubs-hydrogen.cc

Index: src/code-stubs-hydrogen.cc
diff --git a/src/code-stubs-hydrogen.cc b/src/code-stubs-hydrogen.cc
index a968c90c22fe500bfaba8c030cbbdad23f467d2d..ffb55358f1048b4df6e12f620386b16d001bc74e 100644
--- a/src/code-stubs-hydrogen.cc
+++ b/src/code-stubs-hydrogen.cc
@@ -1533,11 +1533,10 @@ HValue* CodeStubGraphBuilderBase::BuildToString(HValue* input, bool convert) {
       }
       if_inputisprimitive.End();
       // Convert the primitive to a string value.
-      ToStringDescriptor descriptor(isolate());
       ToStringStub stub(isolate());
       HValue* values[] = {context(), Pop()};
       Push(AddUncasted<HCallWithDescriptor>(
-          Add<HConstant>(stub.GetCode()), 0, descriptor,
+          Add<HConstant>(stub.GetCode()), 0, stub.GetCallInterfaceDescriptor(),
           Vector<HValue*>(values, arraysize(values))));
     }
     if_inputisstring.End();
@@ -1795,7 +1794,7 @@ Handle<Code> ElementsTransitionAndStoreStub::GenerateCode() {
 
 template <>
 HValue* CodeStubGraphBuilder<ToObjectStub>::BuildCodeStub() {
-  HValue* receiver = GetParameter(ToObjectDescriptor::kReceiverIndex);
+  HValue* receiver = GetParameter(TypeConversionDescriptor::kArgumentIndex);
   return BuildToObject(receiver);
 }