[Atomics] code stubs for atomic operations

src/crankshaft/hydrogen.h

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef V8_CRANKSHAFT_HYDROGEN_H_
 #define V8_CRANKSHAFT_HYDROGEN_H_
 
 #include "src/accessors.h"
 #include "src/allocation.h"
 #include "src/ast/ast.h"
@@ skipping 2254 matching lines @@
   F(FixedArrayGet)                     \
   F(FixedArraySet)                     \
   F(JSCollectionGetTable)              \
   F(StringGetRawHashField)             \
   F(TheHole)                           \
   /* ES6 Iterators */                  \
   F(CreateIterResultObject)            \
   /* Arrays */                         \
   F(HasFastPackedElements)             \
   /* JSValue */                        \
-  F(JSValueGetValue)
+  F(JSValueGetValue)                   \
+  /* Atomics */                        \
+  F(AtomicsLoad)
 
 #define GENERATOR_DECLARATION(Name) void Generate##Name(CallRuntime* call);
   FOR_EACH_HYDROGEN_INTRINSIC(GENERATOR_DECLARATION)
 #undef GENERATOR_DECLARATION
 
   void VisitDelete(UnaryOperation* expr);
   void VisitVoid(UnaryOperation* expr);
   void VisitTypeof(UnaryOperation* expr);
   void VisitNot(UnaryOperation* expr);
 
@@ skipping 778 matching lines @@
 
  private:
   HGraphBuilder* builder_;
 };
 
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_CRANKSHAFT_HYDROGEN_H_