mn10300: fix struct returns and SP off after return command

[Alexandre Oliva]

This patch removes some uses of deprecated GDB features from the GDB
port and, while at that, fixes returns of structures, as well as the
value set for SP after a return command, that was off by as many words
as movm-saved registers in the callee's frame.

Ok to install?

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-- 
Alexandre Oliva             http://www.ic.unicamp.br/~oliva/
Red Hat Compiler Engineer   aoliva@{redhat.com, gcc.gnu.org}
Free Software Evangelist  oliva@{lsd.ic.unicamp.br, gnu.org}