[Atomics] code stubs for atomic operations

src/builtins.h

Index: src/builtins.h
diff --git a/src/builtins.h b/src/builtins.h
index ac4d7890dc464735b372fd7791c2e56c8180d120..0b2adadc49079223de586a16c4fad50d156bc7ef 100644
--- a/src/builtins.h
+++ b/src/builtins.h
@@ -306,14 +306,15 @@ inline bool operator&(BuiltinExtraArguments lhs, BuiltinExtraArguments rhs) {
   CODE_AGE_LIST_WITH_ARG(DECLARE_CODE_AGE_BUILTIN, V)
 
 // Define list of builtins implemented in TurboFan (with JS linkage).
-#define BUILTIN_LIST_T(V) \
-  V(MathCeil, 2)          \
-  V(MathClz32, 2)         \
-  V(MathFloor, 2)         \
-  V(MathRound, 2)         \
-  V(MathSqrt, 2)          \
-  V(MathTrunc, 2)         \
-  V(ObjectHasOwnProperty, 2)
+#define BUILTIN_LIST_T(V)    \
+  V(MathCeil, 2)             \
+  V(MathClz32, 2)            \
+  V(MathFloor, 2)            \
+  V(MathRound, 2)            \
+  V(MathSqrt, 2)             \
+  V(MathTrunc, 2)            \
+  V(ObjectHasOwnProperty, 2) \
+  V(AtomicsLoadCheck, 3)
 
 // Define list of builtin handlers implemented in assembly.
 #define BUILTIN_LIST_H(V)                    \
@@ -653,6 +654,8 @@ class Builtins {
   static void Generate_MarkCodeAsExecutedOnce(MacroAssembler* masm);
   static void Generate_MarkCodeAsExecutedTwice(MacroAssembler* masm);
 
+  static void Generate_AtomicsLoadCheck(compiler::CodeStubAssembler* assembler);
+
   static void InitBuiltinFunctionTable();
 
   bool initialized_;