[RFA] sim/ppc/sim_calls.c: fix broken REGISTER_NAME call

[Stan Shebs]

Michael Elizabeth Chastain wrote:
> 
> Now that the ppc is multi-arched, REGISTER_NAME does not work in the
> simulator (specifically, the sim code does not see gdb's "config.h"
> file, so it does not get the right value of GDB_MULTI_ARCH).  This patch
> changes the ppc simulator to call gdbarch_register_name directly.

Probably I didn't get the memo, but how is this supposed to work for
the standalone simulator?

Stan