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

test/mjsunit/harmony/generators-reduced.js

Index: test/mjsunit/harmony/generators-reduced.js
diff --git a/test/mjsunit/harmony/generators-reduced.js b/test/mjsunit/harmony/generators-reduced.js
new file mode 100644
index 0000000000000000000000000000000000000000..8ea96c6ba5411eb47451ab5d2b655d71d5329328
--- /dev/null
+++ b/test/mjsunit/harmony/generators-reduced.js
@@ -0,0 +1,15 @@
+// Copyright 2016 the V8 project authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+// Flags: --allow-natives-syntax
+
+
+function* h() { try {yield 42} finally {yield 43} };
+function* g() { yield* h(); };
+
+let x = g();
+x.next();
+%OptimizeFunctionOnNextCall(g);
+x.throw(670);
+try { x.next() } catch (e) { }