Migrated several tests from blink to V8 repository.

test/webkit/dfg-int32-to-double-on-known-number.js

Index: test/webkit/dfg-int32-to-double-on-known-number.js
diff --git a/test/webkit/concat-while-having-a-bad-time.js b/test/webkit/dfg-int32-to-double-on-known-number.js
similarity index 75%
copy from test/webkit/concat-while-having-a-bad-time.js
copy to test/webkit/dfg-int32-to-double-on-known-number.js
index dfda1e08a0b36194b787a44ee12a9693acd8aeaf..a3aecada9263a412fee9fbb0fbb5986f8793cb93 100644
--- a/test/webkit/concat-while-having-a-bad-time.js
+++ b/test/webkit/dfg-int32-to-double-on-known-number.js
@@ -22,10 +22,22 @@
 // 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."
+"Tests that we don't emit unnecessary speculation checks when performing an int32 to double conversion on a value that is proved to be a number, predicted to be an int32, but not proved to be an int32."
 );
 
-Object.defineProperty(Array.prototype, 0, { writable: false });
-shouldBe("[42].concat()", "[42]");
-
+function foo(a, b) {
+    var x = a.f;
+    var y;
+    function bar() {
+        return y;
+    }
+    var z = x + b;
+    y = x;
+    if (z > 1)
+        return y + b + bar();
+    else
+        return 72;
+}
 
+for (var i = 0; i < 200; ++i)
+    shouldBe("foo({f:5}, 42.5)", "52.5");