[ignition] Use an intrinsic for GeneratorClose.

src/interpreter/interpreter-intrinsics-generator.cc

Index: src/interpreter/interpreter-intrinsics-generator.cc
diff --git a/src/interpreter/interpreter-intrinsics-generator.cc b/src/interpreter/interpreter-intrinsics-generator.cc
index 6c8bb1390a1562b7f56ec5682f7f032d4c3163d4..30830b8302284919ff16da853fdafe9da3ddaf55 100644
--- a/src/interpreter/interpreter-intrinsics-generator.cc
+++ b/src/interpreter/interpreter-intrinsics-generator.cc
@@ -434,6 +434,18 @@ Node* IntrinsicsGenerator::GeneratorGetResumeMode(Node* args_reg,
   return value;
 }
 
+Node* IntrinsicsGenerator::GeneratorClose(Node* args_reg, Node* arg_count,
+                                          Node* context) {
+  Node* generator = __ LoadRegister(args_reg);
+  Node* const value =
+      __ LoadObjectField(generator, JSGeneratorObject::kResumeModeOffset);
+  __ StoreObjectFieldNoWriteBarrier(
+      generator, JSGeneratorObject::kContinuationOffset,
+      __ SmiConstant(JSGeneratorObject::kGeneratorClosed));
+
+  return value;
+}
+

[neis1, 2017/05/19 17:58:12]

I don't think we need to read and return the mode of the last resumption here.
Is that a copy-paste leftover?

[mvstanton, 2017/05/19 19:11:37]

Good catch! Yes, the runtime function just returns undefined -- I'll craft a fix
asap...

 Node* IntrinsicsGenerator::AsyncGeneratorReject(Node* input, Node* arg_count,
                                                 Node* context) {
   return IntrinsicAsBuiltinCall(input, context,