[patch/cagney_regbuf-20020515-branch] Really separate out old and new

[Andrew Cagney]

Hello,

The attached patch, to the cagney_regbuf-20020515-branch, more strongly 
differentiates between the old and new style register caches by using 
regcache->descr->legacy_p.

For the old case, all registers can be in the cache.  For the new case, 
only 0..NUM_REGS are allowed in the register cache.

In addition, the regcache code only calls legacy_*() functions when 
->legacy_p.  The new code goes straight through.

I think I'm about done with that branch.  I'll next post a full patch 
and figure out how to get something equivalent into the trunk.  More 
importantly, how to do it without breaking SH5.

enjoy,
Andrew
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