rearrange -mcpu= code for rs6000

[Geoffrey Keating <geoffk at apple dot com>]

(This is a repost, the previous version got eaten by a faulty mail 
demon.)

Pretty obvious from the ChangeLog entry, really:

        * config/rs6000/rs6000.c (rs6000_override_options): Make 
processor
        list have list of flags to set and all flags, rather than flags
        to set and flags to clear; add MASK_ALTIVEC where appropriate;
        use enums rather than #defines.

Bootstrapped & tested on powerpc-darwin.

I'll wait a bit before committing this, in the hope that someone can
help me with the FIXME.  In particular:

- Does POWER3 have the GPOPT extensions?
- What about POWER4?  620?  630?
- Does the 8540 have Altivec?

Attachment: rs6000-proctypes.patch
Description: Binary data

--
- Geoffrey Keating <geoffk@apple.com>