Switch ARM, SPARC and i386 to generic dummy frames (PC_IN_CALL_DUMMY)?

[Andrew Cagney]

> AFAIK, generic dummy frames work only with the AT_ENTRY mechanism.
> 
> But for 32 bit SPARC ABI we need ON_STACK, see
> http://sourceware.cygnus.com/ml/gdb/1999-q4/msg00064.html
> http://sources.redhat.com/ml/gdb-patches/2000-05/msg00041.html
> for an explanation.
> 
> I am afraid that we have to extend the generic dummy frame code to allow
> ON_STACK, i

I've this feeling that I might have just (accidently!) done this.  For 
sparc, the problem may be more the register window gunk.

Andrew