"Change Set:		becomeFix
Date:			26 November 2001
Author:			Stephan Rudlof
Version:			2

Avoids the following crash...:
	a _ 'a'.
	a become: a

Changes ProtoObject>>become: to be a noop if self == arg.

Also provides the save method
	Array>>elementsExchangeIdentitySaveWith: otherArray 
from its comment:
	'This method calls #elementsExchangeIdentityWith: after a check 
	ensuring that no pointers occure more than once, which can lead to a 
	crash (don't know, if it always does).'
Note: this method *has* been called by >>become: in the original version of
this changeset: now it has been left in for the more general case of
ensuring safety for exchanging Arrays of oops. ProtoObject>>become: calls
the unsafe version again after successfully doing the check itself now: this
is for performance reasons (the check is just needed in a simplified version
here).
"
-- 
Stephan Rudlof (sr at evolgo.de)
   "Genius doesn't work on an assembly line basis.
    You can't simply say, 'Today I will be brilliant.'"
    -- Kirk, "The Ultimate Computer", stardate 4731.3
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