Migrated several tests from blink to V8 repository.

test/webkit/dfg-phantom-base.js

Index: test/webkit/dfg-phantom-base.js
diff --git a/test/webkit/concat-while-having-a-bad-time.js b/test/webkit/dfg-phantom-base.js
similarity index 79%
copy from test/webkit/concat-while-having-a-bad-time.js
copy to test/webkit/dfg-phantom-base.js
index dfda1e08a0b36194b787a44ee12a9693acd8aeaf..f881b899d1bae9ccbc37ccc04e66be9a2c4a60ef 100644
--- a/test/webkit/concat-while-having-a-bad-time.js
+++ b/test/webkit/dfg-phantom-base.js
@@ -22,10 +22,21 @@
 // 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 use Phantom on the base of put_by_base correctly."
 );
 
-Object.defineProperty(Array.prototype, 0, { writable: false });
-shouldBe("[42].concat()", "[42]");
+function foo(o) {
+    var x = o;
+    var y = o.f;
+    if (y) {
+        o.g.h;
+        return !x;
+    }
 
+    // Do things to ensure that the structure check on o is not hoisted.
+    return o + o + o + o + o;
+}
+
+for (var i = 0; i < 200; ++i)
+    shouldBe("foo(i < 190 ? {f:42, g:{h:3}} : {f:42, g:{}})", "false");