Migrated several tests from blink to V8 repository.

test/webkit/dfg-constant-fold-logical-not-branch.js

Index: test/webkit/dfg-constant-fold-logical-not-branch.js
diff --git a/test/webkit/concat-while-having-a-bad-time.js b/test/webkit/dfg-constant-fold-logical-not-branch.js
similarity index 69%
copy from test/webkit/concat-while-having-a-bad-time.js
copy to test/webkit/dfg-constant-fold-logical-not-branch.js
index dfda1e08a0b36194b787a44ee12a9693acd8aeaf..6a91b14cba39b95b64810c28da8f59a33a826769 100644
--- a/test/webkit/concat-while-having-a-bad-time.js
+++ b/test/webkit/dfg-constant-fold-logical-not-branch.js
@@ -22,10 +22,34 @@
 // 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 what happens if we fail to constant fold a LogicalNot that leads into a branch, when the CFA proves that the LogicalNot has a constant value."
 );
 
-Object.defineProperty(Array.prototype, 0, { writable: false });
-shouldBe("[42].concat()", "[42]");
+function foo1(o) {
+    if (!!o.thingy)
+        return o.thingy(42);
+    else
+        return o.otherThingy(57);
+}
+
+function foo2(o) {
+    if (!o.thingy)
+        return o.otherThingy(42);
+    else
+        return o.thingy(57);
+}
+
+function Stuff() {
+}
+
+Stuff.prototype = {
+    thingy: function(x) { return x + 1; },
+    otherThingy: function(x) { return x - 1; }
+};
+
+for (var i = 0; i < 1000; ++i) {
+    shouldBe("foo1(new Stuff())", "43");
+    shouldBe("foo2(new Stuff())", "58");
+}