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

src/compiler/code-stub-assembler.h

 // Copyright 2015 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_COMPILER_CODE_STUB_ASSEMBLER_H_
 #define V8_COMPILER_CODE_STUB_ASSEMBLER_H_
 
 #include <map>
 
 // Clients of this interface shouldn't depend on lots of compiler internals.
@@ skipping 177 matching lines @@
   // Access to the frame pointer
   Node* LoadFramePointer();
   Node* LoadParentFramePointer();
 
   // Access to the stack pointer
   Node* LoadStackPointer();
 
   // Load raw memory location.
   Node* Load(MachineType rep, Node* base);
   Node* Load(MachineType rep, Node* base, Node* index);
-  Node* AtomicLoad(MachineType rep, Node* base, Node* index);
 
   // Store value to raw memory location.
   Node* Store(MachineRepresentation rep, Node* base, Node* value);
   Node* Store(MachineRepresentation rep, Node* base, Node* index, Node* value);
   Node* StoreNoWriteBarrier(MachineRepresentation rep, Node* base, Node* value);
   Node* StoreNoWriteBarrier(MachineRepresentation rep, Node* base, Node* index,
                             Node* value);
 
 // Basic arithmetic operations.
 #define DECLARE_CODE_STUB_ASSEMBER_BINARY_OP(name) Node* name(Node* a, Node* b);
@@ skipping 178 matching lines @@
   Node* BitFieldDecode(Node* word32, uint32_t shift, uint32_t mask);
 
   // Conversions.
   Node* ChangeFloat64ToTagged(Node* value);
   Node* ChangeInt32ToTagged(Node* value);
   Node* ChangeUint32ToTagged(Node* value);
   Node* TruncateTaggedToFloat64(Node* context, Node* value);
   Node* TruncateTaggedToWord32(Node* context, Node* value);
   // Truncate to int32 using JavaScript truncation mode.
   Node* TruncateFloat64ToInt32(Node* value);
-  // No-op on 32-bit, otherwise zero extend.
-  Node* ChangeUint32ToWord(Node* value);
 
   // Type conversions.
   // Throws a TypeError for {method_name} if {value} is not coercible to Object,
   // or returns the {value} converted to a String otherwise.
   Node* ToThisString(Node* context, Node* value, char const* method_name);
 
   // String helpers.
   // Load a character from a String (might flatten a ConsString).
   Node* StringCharCodeAt(Node* string, Node* smi_index);
   // Return the single character string with only {code}.
@@ skipping 99 matching lines @@
   // Map of variables to the list of value nodes that have been added from each
   // merge path in their order of merging.
   std::map<Variable::Impl*, std::vector<Node*>> variable_merges_;
 };
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_COMPILER_CODE_STUB_ASSEMBLER_H_