PPC: [Interpreter] Add support for JS calls.

src/ppc/interface-descriptors-ppc.cc

Index: src/ppc/interface-descriptors-ppc.cc
diff --git a/src/ppc/interface-descriptors-ppc.cc b/src/ppc/interface-descriptors-ppc.cc
index 5fda82fa7458177b054128bd990e50be705e52d3..9b9d1f6fcb50c3238853fc77e32ee47d6ac90b31 100644
--- a/src/ppc/interface-descriptors-ppc.cc
+++ b/src/ppc/interface-descriptors-ppc.cc
@@ -380,6 +380,17 @@ void MathRoundVariantCallFromOptimizedCodeDescriptor::
   };
   data->InitializePlatformSpecific(arraysize(registers), registers);
 }
+
+
+void PushArgsAndCallDescriptor::InitializePlatformSpecific(
+    CallInterfaceDescriptorData* data) {
+  Register registers[] = {
+      r3,  // argument count (including receiver)
+      r5,  // address of first argument
+      r4   // the target callable to be call
+  };
+  data->InitializePlatformSpecific(arraysize(registers), registers);
+}
 }  // namespace internal
 }  // namespace v8