[patch/sysregs branch] Use reggroups to identify save/restore registers

[Andrew Cagney]

Hello,

The attached re-implements the register save/restore code (used across 
inferior function calls) so that reggroups, instead of iterators, are 
used to identify which registers should be saved or restored.

It has the single advantage of being able to enter:

(gdb) maint print registers

and instantly see which registers are saved/restored across dummy frames.

Beyond that, does anyone have comments about this alternative way of 
iterating over the registers?

Andrew
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