RFA: use constructor to build 'struct regset' objects

[Andrew Cagney]

+ struct regset *regset_xmalloc (void *descr,
+                                supply_regset_ftype *supply_regset,
+                                fill_regset_ftype *fill_regset)
+ {
Can you run the file through gdb_indent.sh?

+   struct regset *r = (struct regset *) xmalloc (sizeof (*r));
Since this data belongs to an architecture, this should be allocated 
from the architecture's obstack.  I suspect this is a pre-existing bug 
but can you still fix it?

Andrew