[Atomics] code stubs for atomic operations

src/code-stubs.h

Index: src/code-stubs.h
diff --git a/src/code-stubs.h b/src/code-stubs.h
index f9bb8309274bbe73bbc06a4dcad7b7ee1b49a6bc..5d9dde412fc0f2626b7f9a8582a61ea9e63ff572 100644
--- a/src/code-stubs.h
+++ b/src/code-stubs.h
@@ -22,6 +22,7 @@ namespace internal {
 #define CODE_STUB_LIST_ALL_PLATFORMS(V)     \
   /* PlatformCodeStubs */                   \
   V(ArrayConstructor)                       \
+  V(AtomicsLoad)                            \
   V(BinaryOpICWithAllocationSite)           \
   V(CallApiCallback)                        \
   V(CallApiGetter)                          \
@@ -3149,6 +3150,14 @@ class ToObjectStub final : public HydrogenCodeStub {
   DEFINE_HYDROGEN_CODE_STUB(ToObject, HydrogenCodeStub);
 };
 
+class AtomicsLoadStub : public PlatformCodeStub {
+ public:
+  explicit AtomicsLoadStub(Isolate* isolate) : PlatformCodeStub(isolate) {}
+
+  DEFINE_CALL_INTERFACE_DESCRIPTOR(AtomicsLoad);
+  DEFINE_PLATFORM_CODE_STUB(AtomicsLoad, PlatformCodeStub);
+};
+
 #undef DEFINE_CALL_INTERFACE_DESCRIPTOR
 #undef DEFINE_PLATFORM_CODE_STUB
 #undef DEFINE_HANDLER_CODE_STUB