[Atomics] code stubs for atomic operations

src/interface-descriptors.h

Index: src/interface-descriptors.h
diff --git a/src/interface-descriptors.h b/src/interface-descriptors.h
index 4411ae169a46f8367230b8344a65580f49d0ea76..b1043aee834dcd1897b855b1d47976bc034e868f 100644
--- a/src/interface-descriptors.h
+++ b/src/interface-descriptors.h
@@ -77,7 +77,8 @@ class PlatformInterfaceDescriptor;
   V(GrowArrayElements)                        \
   V(InterpreterPushArgsAndCall)               \
   V(InterpreterPushArgsAndConstruct)          \
-  V(InterpreterCEntry)
+  V(InterpreterCEntry)                        \
+  V(AtomicsLoad)
 
 
 class CallInterfaceDescriptorData {
@@ -774,6 +775,11 @@ class InterpreterCEntryDescriptor : public CallInterfaceDescriptor {
 };
 
 
+class AtomicsLoadDescriptor : public CallInterfaceDescriptor {
+ public:
+  DECLARE_DESCRIPTOR(AtomicsLoadDescriptor, CallInterfaceDescriptor)
+};
+
 #undef DECLARE_DESCRIPTOR