[patch rfc rfa:i386] Add i386 specific register groups

[Andrew Cagney]

Hello,

The attached patch adds two i386 specific register groups:

+struct reggroup *i386_sse_reggroup;
+struct reggroup *i386_mmx_reggroup;

(hmm, I'll make them static :-) The registers are then distributed 
according to the attached output.

I should note that the orig_eax register is only a member of the system, 
save and restore reggroups, and hence is no longer displayed by either 
`info registers' or `info all-registers'.  If you're really desperate 
you can use the `maint print raw-registers` (which is in the manual :-)

This ok?

--

At a more general level, the current mechanism for adding register 
groups requires the architecture add all relevant groups explicitly vis:

+static void
+i386_add_reggroups (struct gdbarch *gdbarch)
+{
+  reggroup_add (gdbarch, i386_sse_reggroup);
+  reggroup_add (gdbarch, i386_mmx_reggroup);
+  reggroup_add (gdbarch, general_reggroup);
+  reggroup_add (gdbarch, float_reggroup);
+  reggroup_add (gdbarch, all_reggroup);
+  reggroup_add (gdbarch, save_reggroup);
+  reggroup_add (gdbarch, restore_reggroup);
+  reggroup_add (gdbarch, vector_reggroup);
+  reggroup_add (gdbarch, system_reggroup);
+}

this could be changed so that there is a standard pre-defined set, 
architectures only needing to add architecture specific groups.

Thoughts?

Andrew
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