[Atomics] Remove Atomics code stubs; use TF ops

src/compiler/ia32/instruction-selector-ia32.cc

Index: src/compiler/ia32/instruction-selector-ia32.cc
diff --git a/src/compiler/ia32/instruction-selector-ia32.cc b/src/compiler/ia32/instruction-selector-ia32.cc
index 0d5cf4ed48a4861321b2c4ad62acccc395e822ad..cb208f08106672e3b433556caf6e7fb35f1f8936 100644
--- a/src/compiler/ia32/instruction-selector-ia32.cc
+++ b/src/compiler/ia32/instruction-selector-ia32.cc
@@ -1565,6 +1565,14 @@ void InstructionSelector::VisitFloat64InsertHighWord32(Node* node) {
        g.UseRegister(left), g.Use(right));
 }
 
+void InstructionSelector::VisitAtomicLoad(Node* node) {
+  LoadRepresentation load_rep = LoadRepresentationOf(node->op());
+  DCHECK(load_rep.representation() == MachineRepresentation::kWord8 ||
+         load_rep.representation() == MachineRepresentation::kWord16 ||
+         load_rep.representation() == MachineRepresentation::kWord32);
+  USE(load_rep);
+  VisitLoad(node);
+}
 
 // static
 MachineOperatorBuilder::Flags