Save/restore only live registers in the generator suspend/resume.

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 5ac3b6769e3f7f0491967e7cde69e678273585a6..a3ea21a28b1d72709486da93b9123086393f1a49 100644
--- a/src/compiler/js-operator.h
+++ b/src/compiler/js-operator.h
@@ -770,8 +770,9 @@ class V8_EXPORT_PRIVATE JSOperatorBuilder final
   const Operator* GeneratorStore(int register_count,
                                  SuspendFlags suspend_flags);
 
-  // Used to implement Ignition's ResumeGenerator bytecode.
+  // Used to implement Ignition's RestoreGeneratorState bytecode.
   const Operator* GeneratorRestoreContinuation();
+  // Used to implement Ignition's RestoreGeneratorRegisters bytecode.
   const Operator* GeneratorRestoreRegister(int index);
 
   const Operator* StackCheck();