Merge revision 6500-6600 from bleeding_edge to the isolates branch.

ChangeLog

Index: ChangeLog
===================================================================
--- ChangeLog	(revision 7030)
+++ ChangeLog	(working copy)
@@ -1,3 +1,30 @@
+2011-02-02: Version 3.1.1
+
+        Perform security checks before fetching the value in
+        Object.getOwnPropertyDescriptor.
+
+        Fixed a bug in Array.prototype.splice triggered by passing no
+        arguments.
+
+        Fixed bugs in -0 in arithmetic and in Math.pow.
+
+        Fixed bugs in the register allocator and in switching from optimized
+        to unoptimized code.
+
+
+2011-01-31: Version 3.1.0
+
+        Performance improvements on all platforms.
+
+
+2011-01-28: Version 3.0.12
+
+        Added support for strict mode parameter and object property
+        validation.
+
+        Fixed a couple of crash bugs.
+
+
 2011-01-25: Version 3.0.11
 
         Fixed a bug in deletion of lookup slots that could cause global