[Atomics] Make Atomics.exchange a builtin using TF

src/compiler/code-assembler.h

Index: src/compiler/code-assembler.h
diff --git a/src/compiler/code-assembler.h b/src/compiler/code-assembler.h
index 8808a82f8e8950c71f1e74f33685b9b58cabddc3..0d2aa72835d851893e0e53517cd47b4066a5c928 100644
--- a/src/compiler/code-assembler.h
+++ b/src/compiler/code-assembler.h
@@ -272,6 +272,9 @@ class V8_EXPORT_PRIVATE CodeAssembler {
   Node* AtomicStore(MachineRepresentation rep, Node* base, Node* offset,
                     Node* value);
 
+  // Exchange value at raw memory location
+  Node* AtomicExchange(MachineType type, Node* base, Node* offset, Node* value);
+
   // Store a value to the root array.
   Node* StoreRoot(Heap::RootListIndex root_index, Node* value);