Migrated several tests from blink to V8 repository.

test/webkit/dfg-multi-basic-block-structure-clobber.js

Index: test/webkit/dfg-multi-basic-block-structure-clobber.js
diff --git a/test/webkit/concat-while-having-a-bad-time.js b/test/webkit/dfg-multi-basic-block-structure-clobber.js
similarity index 67%
copy from test/webkit/concat-while-having-a-bad-time.js
copy to test/webkit/dfg-multi-basic-block-structure-clobber.js
index dfda1e08a0b36194b787a44ee12a9693acd8aeaf..a4d8bdb99a457a5999ba58a893251738e714e170 100644
--- a/test/webkit/concat-while-having-a-bad-time.js
+++ b/test/webkit/dfg-multi-basic-block-structure-clobber.js
@@ -22,10 +22,35 @@
 // 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."
+"This tests that a structure clobber in a basic block that does not touch a live variable causes that variable's structure to be correctly clobbered."
 );
 
-Object.defineProperty(Array.prototype, 0, { writable: false });
-shouldBe("[42].concat()", "[42]");
+var clobberedObject;
 
+function bar() {
+    if (!clobberedObject)
+        return;
+    delete clobberedObject.f;
+    clobberedObject.g = 42;
+}
+
+function foo(p, o_) {
+    var o = o_.f; // Force this block to have a SetLocal.
+    var x = o.f;
+    if (p)
+        bar();
+    return x + o.f;
+}
+
+var expected = 2;
+
+for (var i = 0; i < 200; ++i) {
+    var object = {f:1};
+    var predicate = true;
+    if (i >= 150) {
+        clobberedObject = object;
+        expected = 0/0; // "NaN"
+    }
+    shouldBe("foo(predicate, {f:object})", "" + expected);
+}