PROBLEM: (94237, 94240, 93737) (PATCH ID: OSF540-333)
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This patch corrects the way the Spike code optimization tool handles the -arch 
and -tune options, fixing the following problems:  
* Corrects the -tune option accepting values outside of the documented valid 
range

* Corrects the problem where Spike creates meaningless message numbers whenever 
-arch is set higher than than -tune.  For example:

        $ spike a.out -tune ev6 -arch ev68
          spike: Info: message number 09DB8313

* Corrects the memory acces violation error caused when specifying '-arch host' 
or '-arch generic'. For example:

        $ spike a.out -arch generic
          A memory access violation (bus error or segmentation fault) has  
	  occurred.