Migrated several tests from blink to V8 repository.

test/webkit/dfg-mispredict-variable-but-prove-int.js

Index: test/webkit/dfg-mispredict-variable-but-prove-int.js
diff --git a/test/webkit/concat-while-having-a-bad-time.js b/test/webkit/dfg-mispredict-variable-but-prove-int.js
similarity index 78%
copy from test/webkit/concat-while-having-a-bad-time.js
copy to test/webkit/dfg-mispredict-variable-but-prove-int.js
index dfda1e08a0b36194b787a44ee12a9693acd8aeaf..c312670317d954d4e91a035844dbccf32d3bf248 100644
--- a/test/webkit/concat-while-having-a-bad-time.js
+++ b/test/webkit/dfg-mispredict-variable-but-prove-int.js
@@ -22,10 +22,23 @@
 // 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 a variable predicted to be either int or double but proven to be an int does confuse the Branch logic."
 );
 
-Object.defineProperty(Array.prototype, 0, { writable: false });
-shouldBe("[42].concat()", "[42]");
+function foo(a, b, c) {
+    a = b;
+    if (c) {
+        if (a)
+            return 1;
+        else
+            return 2;
+    } else if (b)
+        a = 0.5;
+    return a;
+}
 
+shouldBe("foo(0, 1, 0)", "0.5");
+
+for (var i = 0; i < 200; ++i)
+    shouldBe("foo(i, i + 1, i + 2)", "1");