Migrated several tests from blink to V8 repository.

test/webkit/dfg-force-exit-then-sparse-conditional-constant-prop-in-loop.js

Index: test/webkit/dfg-force-exit-then-sparse-conditional-constant-prop-in-loop.js
diff --git a/test/webkit/concat-while-having-a-bad-time.js b/test/webkit/dfg-force-exit-then-sparse-conditional-constant-prop-in-loop.js
similarity index 74%
copy from test/webkit/concat-while-having-a-bad-time.js
copy to test/webkit/dfg-force-exit-then-sparse-conditional-constant-prop-in-loop.js
index dfda1e08a0b36194b787a44ee12a9693acd8aeaf..6516ac434a6ae598c6fc909bb2fe3d106a101b21 100644
--- a/test/webkit/concat-while-having-a-bad-time.js
+++ b/test/webkit/dfg-force-exit-then-sparse-conditional-constant-prop-in-loop.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."
+"Checks that increased aggressiveness in sparse conditional constant propagation resultin from a node being proven to be force exit does not lead to a cascade of unsound decisions."
 );
 
-Object.defineProperty(Array.prototype, 0, { writable: false });
-shouldBe("[42].concat()", "[42]");
+function foo(a) {
+    var i;
+    if (a.push)
+        i = 0;
+    else
+        i = a;
+    var result = 0;
+    while (i < 10) {
+        result += a[i];
+        i++;
+    }
+    return result;
+}
 
+var array = [54, 5432, 1234, 54, 1235, 64, 75, 532, 64, 2];
 
+for (var i = 0; i < 200; ++i)
+    shouldBe("foo(array)", "8746");