Work around Android's pthread/kernel_id/fork bug to fix mono multithreading and GC_stop_world in processes that have been forked.

error_msg is null when passed into this function from a few places, so
lets not do a null deref here.

Fix a deadlock introduced by 5c2e3bf7 by using a separate low level lock to procect access to the file_share_hash hash table. Fixes #642985.

[wcf] serialization member namespace was wrong when root namesp ace is given. Fixed possible infinite loop during DefaultTypeMap initialization.

MS Basic/Contract/Data/POCO sample got working fine.

If ReleaseResources or Flush (true) were called, a flag is set that causes
any subsequent Flush () calls to fail with an exception.
At the same time, ReleaseResources does not destroy the output stream completely -
it has to remain around to match .NET behavior.

This reverts commit a4ed8be6 since what we
do in ReleaseResources is not what .NET does - a better fix will follow.

	The callbacks need to be invoked in different threads to avoid clogging
	the IO pool.

	Fixes bug #639656.

Disable the freeing of monitors again, it still crashes with sgen when running tests/async_read.exe.

* System.Net.Sockets/Socket_2_1.cs: Fix, by explicitely throwing an NRE,
the checks in [Receive|Send]Async methods - otherwise an exception would
occur later, on another thread and close the socket (leading to other,
unexpected, exceptions)

* Test/System.Net.Sockets/SocketTest.cs: Add parameter validation test
cases for both ReceiveAsync and SendAsync

* System.Net.Sockets/SocketAsyncEventArgs.cs: Move policy restriction
and elevated trust check outside of loop since its value won't change
based on the ipaddress

* System.Net.Sockets/Socket_2_1.cs: Do not #id-def out [Receive|Send]
Generic from moonlight build

	If creating the xdb.il file fails, disable the mono support for
	debugging in gdb. Managed symbol names won't be displayed in stack
	traces.

	Fixes bug #642625.

	* marshal.c (mono_marshal_get_delegate_invoke): Properly
	handle a static method that has it's first argument bound.

	* marshal.c (mono_marshal_free_inflated_wrappers): Free
	from the new hashtable too.

	* image.c (mono_image_close_except_pools): Free the new
	hash table.

	* metadata-internals.h (MonoImage): Add new hashtable
	to store the new kind of invoke wrappers.

Fix possible state corruption in the case where Upgradeable wasn't reactivating its read bit after a downgrade and set events accordingly. Fix possible race where a write process wannabe could step in the middle of Upgradeable actually upgrading to write mode.

[wcf-discovery] ExclusiveAddressUse won't work. AcceptChannel() should nreturn null when it is being closed.

SvcHttpHandler maintains a mapping of HttpContext to ManualResetEvent. Entries are
removed from the cache in EndHttpRequest. The code makes sure the context exists in
the cache before attempting to access it.