[patch,rfc] builtin regs -> user regs

[Andrew Cagney]

Hello,

Ref: Three register layers
http://sources.redhat.com/ml/gdb/2003-06/msg00437.html

This patch replaces the builtin registers with user [visible] per-frame 
registers.

The builtin registers were global - always present regardless of the 
architecture.  These new user [visible] registers support both global, 
and per-architecture registers.

As with the above post, these registers live on top of the frame vis:

	user
	 |
	cooked/frame
	 |
	raw

and this makes it possible to construct user visible registers using 
per-frame register values.  In the case of the MIPS, the 64 bit $fpr0 
would be the concatenation of the two 32 bit registers: $fgr0 and $fgr1.

Please note though that the way registers are read/written needs further 
refinement (I left it as is for the moment).  I suspect, for instance, 
that currently register writes don't work at all.

I'm also not comfortable with using `builtin' for the registers that 
apply to all architectures.  Perhaphs:
	user_reg_add_all
	user_reg_add_global
are better.  Thougts?

comments?
Andrew

(no this isn't for the 6.0 branch)
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