Combined patch from master branch

Combined patch from master branch

 	From: Jack Ren <jack.ren@intel.com>
 	Date: Tue, 1 Mar 2011 21:10:42 +0800
 	Subject: [PATCH 1/2] sync with korg/master commit dd19f5b91a1032e60871febb143850fd81000c5a

	following patches are applied in one time:

	commit dd19f5b91a1032e60871febb143850fd81000c5a
	Merge: 2b3d7e8 a62c84f
	Author: Romain Guy <romainguy@android.com>
	Date:   Thu Feb 24 11:24:47 2011 -0800

	    Merge "Fix for a crash when GC weak references."

	commit 2b3d7e8eccd7cbf64b2ac41c05073a9191d0d3b3
	Merge: ef4b061 b4719ed
	Author: Raphael Moll <ralf@android.com>
	Date:   Tue Feb 22 14:55:59 2011 -0800

	    Merge "Open dexdump files in binary mode."

	commit b4719eda048c4dc4a4b6e5280c7a2b8299051078
	Author: Raphael Moll <ralf@android.com>
	Date:   Wed Feb 16 13:39:27 2011 -0800

	    Open dexdump files in binary mode.

	    Requires change Ia5c0a59e from system/core
	    (which defines O_BINARY globally.)

	commit a62c84f62a27a08d6bef6da0b96913d616dd659f
	Author: Mattias Petersson <mattias.petersson@sonyericsson.com>
	Date:   Tue Dec 21 09:28:04 2010 +0100

	    Fix for a crash when GC weak references.

	    When a weak reference had been cleared there was a small risk that
	    the VM crashed when the cleared reference was garbage collected.

	    This is an example of code that can cause the problem:
	       Integer referent = new Integer(10);
	       wref = new WeakReference<Integer>(referent);
	       wref.clear(); //set the referent to null

	    When a garbage collection starts, all objects are scanned, looking
	    for objects that can be collected. During this phase, a list of
	    weak references is created. A check is performed to ensure that
	    only references with a non-null referent are added to this list.
	    In most cases, for the example above, the referent will be null
	    at this point, and it will never be added to the list. But if
	    the timing is extremely bad it looks like it is possible for the
	    reference to end up on the list before the referent has been set
	    to null, and the referent is set to null a little while later.
	    This means that we now have a reference on the list with a null
	    referent.

	    A bit later in the garbage collection flow, the list of weak

	s is traversed in order to clear the references that
	    can be collected. Here we got the crash because the code asserted
	    that the referent of the references in the list should be
	    non-null. And in some rare cases it actually was null. The fix
	    is simply to remove the assert.

	commit ef4b0613d6952770aefac07d503955eb7b962d2b
	Merge: 464104b e9503ef
	Author: Andy McFadden <fadden@android.com>
	Date:   Mon Nov 8 19:38:19 2010 -0800

	    am e9503ef8: am 886130bc: (-s ours) Two patches.

	    * commit 'e9503ef8c460f4818062ecc80a9e0b4f8c6745b8':
	      Two patches.

Change-Id: I04c1c9204af8197a4352358d805af40f1312d2ea
Signed-off-by: Bruce Beare <bruce.j.beare@intel.com>