Update V8 to r6101 as required by WebKit r74534

Change-Id: I7f84af8dd732f11898fd644b2c2b1538914cb78d
diff --git a/test/mjsunit/regress/regress-580.js b/test/mjsunit/regress/regress-580.js
index c6b3db7..6b1d098 100644
--- a/test/mjsunit/regress/regress-580.js
+++ b/test/mjsunit/regress/regress-580.js
@@ -32,22 +32,22 @@
   var x;
   var tmp = 0;
   x = (tmp = 1578221999, tmp)+(tmp = 572285336, tmp);
-  assertEquals(2150507335, x);
+  assertEquals(2150507335, x, "++");
   x = 1578221999 + 572285336;
   assertEquals(2150507335, x);
 
   x = (tmp = -1500000000, tmp)+(tmp = -2000000000, tmp);
-  assertEquals(-3500000000, x);
+  assertEquals(-3500000000, x, "+-");
   x = -1500000000 + -2000000000;
   assertEquals(-3500000000, x);
 
   x = (tmp = 1578221999, tmp)-(tmp = -572285336, tmp);
-  assertEquals(2150507335, x);
+  assertEquals(2150507335, x, "--");
   x = 1578221999 - -572285336;
   assertEquals(2150507335, x);
 
   x = (tmp = -1500000000, tmp)-(tmp = 2000000000, tmp);
-  assertEquals(-3500000000, x);
+  assertEquals(-3500000000, x, "-+");
   x = -1500000000 - 2000000000;
   assertEquals(-3500000000, x);
 }