Migrated several tests from blink to V8 repository.

test/webkit/constant-count.js

Index: test/webkit/constant-count.js
diff --git a/test/webkit/concat-while-having-a-bad-time.js b/test/webkit/constant-count.js
similarity index 86%
copy from test/webkit/concat-while-having-a-bad-time.js
copy to test/webkit/constant-count.js
index dfda1e08a0b36194b787a44ee12a9693acd8aeaf..7bc67e799b7fe606b020564f088377071d35db76 100644
--- a/test/webkit/concat-while-having-a-bad-time.js
+++ b/test/webkit/constant-count.js
@@ -22,10 +22,24 @@
 // SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
 description(
-"Tests the behavior of Array.prototype.concat while the array is having a bad time due to one of the elements we are concatenating."
+"This test checks exceptional cases for constant counting in the parser."
 );
 
-Object.defineProperty(Array.prototype, 0, { writable: false });
-shouldBe("[42].concat()", "[42]");
+const a;
+const b;
+--a;
+--b;
 
+shouldBe("a", "undefined");
 
+function f()
+{
+    const a;
+    const b;
+    --a;
+    --b;
+
+    return a;
+}
+
+shouldBe("f()", "undefined");