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

src/compiler/code-stub-assembler.cc

Index: src/compiler/code-stub-assembler.cc
diff --git a/src/compiler/code-stub-assembler.cc b/src/compiler/code-stub-assembler.cc
index 7e4d4c4cfbc9f61a3f3d06a06ea72b09b0eca355..02efccac14db8b8dda38ab9b44b9e8d23f3062e0 100644
--- a/src/compiler/code-stub-assembler.cc
+++ b/src/compiler/code-stub-assembler.cc
@@ -742,10 +742,6 @@
 
 Node* CodeStubAssembler::Load(MachineType rep, Node* base, Node* index) {
   return raw_assembler_->Load(rep, base, index);
-}
-
-Node* CodeStubAssembler::AtomicLoad(MachineType rep, Node* base, Node* index) {
-  return raw_assembler_->AtomicLoad(rep, base, index);
 }
 
 Node* CodeStubAssembler::Store(MachineRepresentation rep, Node* base,
@@ -1320,13 +1316,6 @@
                                                 value);
 }
 
-Node* CodeStubAssembler::ChangeUint32ToWord(Node* value) {
-  if (raw_assembler_->machine()->Is64()) {
-    value = raw_assembler_->ChangeUint32ToUint64(value);
-  }
-  return value;
-}
-
 void CodeStubAssembler::BranchIf(Node* condition, Label* if_true,
                                  Label* if_false) {
   Label if_condition_is_true(this), if_condition_is_false(this);