Prepare push to trunk. Now working on version 3.1.2.

ChangeLog

Index: ChangeLog
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+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.