Revert team and thread changes for COMPAT_MODE (hrev52010 & hrev52011).

This reverts commit c558f9c8fe.
This reverts commit 44f24718b1.
This reverts commit a69cb33030.
This reverts commit 951182620e.

There have been multiple reports that these changes break mounting NTFS partitions
(on all systems, see #14204), and shutting down (on certain systems, see #12405.)
Until they can be fixed, they are being backed out.

headers/private/kernel/vm/VMAddressSpace.h

@@ -35,10 +35,6 @@ public:
 			addr_t				Base() const			{ return fBase; }
 			addr_t				EndAddress() const		{ return fEndAddress; }
 			size_t				Size() const { return fEndAddress - fBase + 1; }
-			void				SetSize(size_t size) {
-									fEndAddress = fBase + (size - 1);
-									fFreeSpace = size; }
-
 			size_t				FreeSpace() const		{ return fFreeSpace; }
 			bool				IsBeingDeleted() const	{ return fDeleting; }