[turbofan] Implement intrinsic lowering of %_GeneratorClose.

src/compiler/js-intrinsic-lowering.h

Index: src/compiler/js-intrinsic-lowering.h
diff --git a/src/compiler/js-intrinsic-lowering.h b/src/compiler/js-intrinsic-lowering.h
index 59e6f492cd62e73eb431f3393b8a547a13428c29..0d40d859cd432123bed6e3cd53d1a449bef8bd04 100644
--- a/src/compiler/js-intrinsic-lowering.h
+++ b/src/compiler/js-intrinsic-lowering.h
@@ -42,6 +42,7 @@ class JSIntrinsicLowering final : public AdvancedReducer {
   Reduction ReduceDeoptimizeNow(Node* node);
   Reduction ReduceDoubleHi(Node* node);
   Reduction ReduceDoubleLo(Node* node);
+  Reduction ReduceGeneratorClose(Node* node);
   Reduction ReduceIsInstanceType(Node* node, InstanceType instance_type);
   Reduction ReduceIsJSReceiver(Node* node);
   Reduction ReduceIsSmi(Node* node);