Migrated several tests from blink to V8 repository.

test/webkit/dfg-int-overflow-large-constants-in-a-line.js

Index: test/webkit/dfg-int-overflow-large-constants-in-a-line.js
diff --git a/test/webkit/concat-while-having-a-bad-time.js b/test/webkit/dfg-int-overflow-large-constants-in-a-line.js
similarity index 51%
copy from test/webkit/concat-while-having-a-bad-time.js
copy to test/webkit/dfg-int-overflow-large-constants-in-a-line.js
index dfda1e08a0b36194b787a44ee12a9693acd8aeaf..4e2f970dd49e132de6a8296f2f6da1338b3dd911 100644
--- a/test/webkit/concat-while-having-a-bad-time.js
+++ b/test/webkit/dfg-int-overflow-large-constants-in-a-line.js
@@ -22,10 +22,55 @@
 // 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 our optimization to elide overflow checks understands that if we keep adding huge numbers, we could end up creating a number that is not precisely representable using doubles."
 );
 
-Object.defineProperty(Array.prototype, 0, { writable: false });
-shouldBe("[42].concat()", "[42]");
+function foo(a) {
+    var x = a;
+    x += 281474976710655;
+    x += 281474976710654;
+    x += 281474976710653;
+    x += 281474976710652;
+    x += 281474976710655;
+    x += 281474976710654;
+    x += 281474976710653;
+    x += 281474976710652;
+    x += 281474976710655;
+    x += 281474976710654;
+    x += 281474976710653;
+    x += 281474976710652;
+    x += 281474976710655;
+    x += 281474976710654;
+    x += 281474976710653;
+    x += 281474976710652;
+    x += 281474976710655;
+    x += 281474976710654;
+    x += 281474976710653;
+    x += 281474976710652;
+    x += 281474976710655;
+    x += 281474976710654;
+    x += 281474976710653;
+    x += 281474976710652;
+    x += 281474976710655;
+    x += 281474976710654;
+    x += 281474976710653;
+    x += 281474976710652;
+    x += 281474976710655;
+    x += 281474976710654;
+    x += 281474976710653;
+    x += 281474976710652;
+    x += 281474976710655;
+    x += 281474976710654;
+    x += 281474976710653;
+    x += 281474976710652;
+    x += 281474976710655;
+    x += 281474976710654;
+    x += 281474976710653;
+    x += 281474976710652;
+    return x | 0
+}
+
+for (var i = 0; i < 200; ++i)
+    shouldBe("foo(2147483647)", "2147483552");