[Atomics] code stubs for atomic operations

src/arm/interface-descriptors-arm.cc

Index: src/arm/interface-descriptors-arm.cc
diff --git a/src/arm/interface-descriptors-arm.cc b/src/arm/interface-descriptors-arm.cc
index eaa8524b66c89629268d7c874516e085583faa7c..77090740a477e9d09d3e0c39cead1c8d97fc0f73 100644
--- a/src/arm/interface-descriptors-arm.cc
+++ b/src/arm/interface-descriptors-arm.cc
@@ -463,6 +463,14 @@ void InterpreterCEntryDescriptor::InitializePlatformSpecific(
   data->InitializePlatformSpecific(arraysize(registers), registers);
 }
 
+
+void AtomicsLoadDescriptor::InitializePlatformSpecific(
+    CallInterfaceDescriptorData* data) {
+  Register registers[] = {r1, r0};
+  data->InitializePlatformSpecific(arraysize(registers), registers);
+}
+
+
 }  // namespace internal
 }  // namespace v8