Update V8 to r5804 as required by WebKit r72274

Change-Id: I287670630b22383dbce46e4a6fad4ec9eb37d8b8
diff --git a/ChangeLog b/ChangeLog
index ea07009..573ebb3 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,12 @@
+2010-11-10: Version 2.5.6
+
+        Added support for VFP rounding modes to the ARM simulator.
+
+        Fixed multiplication overflow bug (issue 927).
+
+        Added a limit for the amount of executable memory (issue 925).
+
+
 2010-11-08: Version 2.5.5
 
         Added more aggressive GC of external objects in near out-of-memory