Request for Review (XS): 7087445, Improve platform independence of JSR292 shared code

[Bertrand Delsart]

Small shared changes necessary to improve portability of jsr292
on some platforms.

http://cr.openjdk.java.net/~bdelsart/7087445/webrev.00/

Should have no impact on the existing ports, as long as
you add this backward compatible definition (added to SPARC,
x86 and zero):

intptr_t *frame::initial_deoptimization_info() {
   return fp();
}

Thanks,

Bertrand.
-- 
Bertrand Delsart,               bertrand.delsart at oracle.com,
Sun-Oracle France, 180 av. de l'Europe, ZIRST de Montbonnot,
38334 Saint Ismier,                                  FRANCE