Add %GetCallerJSFunction intrinsic

test/mjsunit/get-caller-js-function.js

+// Copyright 2015 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: --turbo-deoptimization --allow-natives-syntax
+
+var a = function() {
+  return %GetCallerJSFunction();

[Sven Panne, 2015/05/20 14:05:48]

This will *always* call the runtime function, do you mean %_GetCallerJSFunction?

[danno, 2015/05/22 11:21:35]

Good catch. Will fix.

+}
+var b = function() {
+  return a();
+}
+assertEquals(b, b());
+
+var c = function() {
+  return a();
+}
+c();

[Michael Starzinger, 2015/05/20 14:25:18]

nit: Can we wrap all three calls to "c" into an assertEquals checking the return
value?

[danno, 2015/05/22 11:21:35]

Done.

+c();
+%SetForceInlineFlag(a);
+%OptimizeFunctionOnNextCall(c);
+c();
+
+%SetForceInlineFlag(b);
+var d = function() {
+  return b();
+}
+d();

[Michael Starzinger, 2015/05/20 14:25:18]

nit: Likewise.

[danno, 2015/05/22 11:21:35]

Done.

+d();
+%OptimizeFunctionOnNextCall(d);
+d();
+assertEquals(b, d());