Prepare push to trunk. Now working on version 3.9.21.

ChangeLog

+2012-03-19: Version 3.9.20
+
+        Fix declarations escaping global strict eval. (Issue 1624)
+
+        Fix wrapping of receiver for non-strict callbacks. (Issue 1973)
+
+        Fix function declarations overwriting read-only global properties.
+        (Chromium issue 115452)
+
+        Fix --use-strict flag in combination with --harmony[-scoping].
+
+        Debugger: naive implementation of "step into Function.prototype.bind".
+
+        Debugger: add ability to set script source from within OnBeforeCompile.
+
+        Add flag to always call DebugBreak on abort.
+
+        Re-enable constructor inlining and inline === comparison with boolean
+        constants. (Issue 2009)
+
+        Don't use an explicit s0 in ClampDoubleToUint8. (Issue 2004)
+
+        Performance and stability improvements on all platforms.
+
+
 2012-03-14: Version 3.9.19
 
         Ensure there is a smi check of the receiver for global load and call
         ICs (Chromium issue 117794).
 
         Performance and stability improvements on all platforms.
 
 
 2012-03-13: Version 3.9.18
 
@@ skipping 3855 matching lines @@
         setting break points in them.
 
 
 2008-07-03: Version 0.1.0
 
         Initial export.
 
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