[generators] Always call function with closure context when resuming.

src/interpreter/bytecode-generator.cc

Index: src/interpreter/bytecode-generator.cc
diff --git a/src/interpreter/bytecode-generator.cc b/src/interpreter/bytecode-generator.cc
index 84cd94393e1396888b561e011158672c9c45d0f0..4d2b1418860027693aa40ffe050f3ca8756a09a0 100644
--- a/src/interpreter/bytecode-generator.cc
+++ b/src/interpreter/bytecode-generator.cc
@@ -799,10 +799,13 @@ void BytecodeGenerator::VisitGeneratorPrologue() {
       ->LoadAccumulatorWithRegister(generator_object)
       .JumpIfUndefined(&regular_call);
 
-  // This is a resume call. Restore registers and perform state dispatch.
-  // (The current context has already been restored by the trampoline.)
+  // This is a resume call. Restore the current context and the registers, then
+  // perform state dispatch.
+  Register dummy = register_allocator()->NewRegister();
   builder()
-      ->ResumeGenerator(generator_object)
+      ->CallRuntime(Runtime::kInlineGeneratorGetContext, generator_object)
+      .PushContext(dummy)
+      .ResumeGenerator(generator_object)
       .StoreAccumulatorInRegister(generator_state_);
   BuildIndexedJump(generator_state_, 0, generator_resume_points_.size(),
                    generator_resume_points_);