JSEntryTrampoline: check for stack space before pushing arguments

test/mjsunit/regress/regress-crbug-469768.js

Index: test/mjsunit/regress/regress-crbug-469768.js
diff --git a/test/mjsunit/regress/regress-crbug-469768.js b/test/mjsunit/regress/regress-crbug-469768.js
new file mode 100644
index 0000000000000000000000000000000000000000..e8a16b06e335bc70574dfbef4fefb99d5541337e
--- /dev/null
+++ b/test/mjsunit/regress/regress-crbug-469768.js
@@ -0,0 +1,33 @@
+// 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.
+
+// Try several different argument counts to make sure none of them
+// sneak through the system of stack checks.
+
+try {
+  Array.prototype.concat.apply([], new Array(100000));
+} catch (e) {
+  // Throwing is fine, just don't crash.
+}
+
+
+try {
+  Array.prototype.concat.apply([], new Array(150000));
+} catch (e) {
+  // Throwing is fine, just don't crash.
+}
+
+
+try {
+  Array.prototype.concat.apply([], new Array(200000));
+} catch (e) {
+  // Throwing is fine, just don't crash.
+}
+
+
+try {
+  Array.prototype.concat.apply([], new Array(248000));
+} catch (e) {
+  // Throwing is fine, just don't crash.
+}