SPE configuration in GCC

[David Edelsohn]

>>>>> Mark Mitchell writes:

Mark> As a secondary issue, it would be nice to have a GCC-wide policy about 
Mark> whether "target-elf" should support all variants of a chip, or just 
Mark> some.  Based on my knowledge of users, I'd suggest that it should 
Mark> support all variants.

	No objection.

Mark> As another secondary issue, I consider it a bug in the PowerPC back end 
Mark> that command-line options (like -misel) are silently ignored in the 
Mark> default configuration.  If you agree, I can file a PR about that.

	Okay.  I think this has to do with the SPE options having been
placed in rs6000.h TARGET_OPTIONS instead of SUBTARGET_OPTIONS.

David