[x86] Sane default for Label::Distance on JumpIfRoot/JumpIfNotRoot.

test/mjsunit/regress/regress-crbug-563929.js

Index: test/mjsunit/regress/regress-crbug-563929.js
diff --git a/test/mjsunit/regress/regress-crbug-563929.js b/test/mjsunit/regress/regress-crbug-563929.js
new file mode 100644
index 0000000000000000000000000000000000000000..a9a112dd8deffb1cdba8a6050df60bf1b13192a7
--- /dev/null
+++ b/test/mjsunit/regress/regress-crbug-563929.js
@@ -0,0 +1,31 @@
+// 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.
+
+var x = 0;
+function a() {
+  eval("");
+  return (function() {
+    eval("");
+    return (function() {
+      eval("");
+      return (function() {
+        eval("");
+        return (function() {
+          eval("");
+          return (function() {
+            eval("");
+            return (function() {
+              eval("");
+              return (function() {
+                eval("");
+                return x;
+              })();
+            }) ();
+          })();
+        })();
+      })();
+    })();
+  })();
+}
+assertEquals(a(), 0);