[generators] Replace some runtime functions with Turbofan JS operators.

src/compiler/js-operator.h

Index: src/compiler/js-operator.h
diff --git a/src/compiler/js-operator.h b/src/compiler/js-operator.h
index 750817a0f243736de8bb2d1827baabba343a9555..a65e534ba7384ca2364d8d58c706afb5543dcaa2 100644
--- a/src/compiler/js-operator.h
+++ b/src/compiler/js-operator.h
@@ -470,6 +470,13 @@ class JSOperatorBuilder final : public ZoneObject {
   const Operator* LoadMessage();
   const Operator* StoreMessage();
 
+  // Used to implement Ignition's SuspendGenerator bytecode.
+  const Operator* GeneratorStore(int register_count);
+
+  // Used to implement Ignition's ResumeGenerator bytecode.
+  const Operator* GeneratorRestoreContinuation();
+  const Operator* GeneratorRestoreRegister(int index);
+
   const Operator* StackCheck();
 
   const Operator* CreateFunctionContext(int slot_count);