Revert of [Atomics] Remove Atomics code stubs; use TF ops

src/code-stubs.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_CODE_STUBS_H_
 #define V8_CODE_STUBS_H_
 
 #include "src/allocation.h"
 #include "src/assembler.h"
 #include "src/codegen.h"
 #include "src/compiler/code-stub-assembler.h"
 #include "src/globals.h"
 #include "src/ic/ic-state.h"
 #include "src/interface-descriptors.h"
 #include "src/macro-assembler.h"
 #include "src/ostreams.h"
 
 namespace v8 {
 namespace internal {
 
 // List of code stubs used on all platforms.
 #define CODE_STUB_LIST_ALL_PLATFORMS(V)     \
   /* PlatformCodeStubs */                   \
   V(ArrayConstructor)                       \
+  V(AtomicsLoad)                            \
   V(BinaryOpICWithAllocationSite)           \
   V(CallApiCallback)                        \
   V(CallApiGetter)                          \
   V(CallConstruct)                          \
   V(CallIC)                                 \
   V(CEntry)                                 \
   V(CompareIC)                              \
   V(DoubleToI)                              \
   V(FunctionPrototype)                      \
   V(InstanceOf)                             \
@@ skipping 3107 matching lines @@
 
 
 class ToObjectStub final : public HydrogenCodeStub {
  public:
   explicit ToObjectStub(Isolate* isolate) : HydrogenCodeStub(isolate) {}
 
   DEFINE_CALL_INTERFACE_DESCRIPTOR(TypeConversion);
   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
 #undef DEFINE_HYDROGEN_CODE_STUB
 #undef DEFINE_CODE_STUB
 #undef DEFINE_CODE_STUB_BASE
 
 extern Representation RepresentationFromType(Type* type);
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_CODE_STUBS_H_