[rfc] Convert SOFTWARE_SINGLE_STEP to multi-arch

[Andrew Cagney]

Andrew Cagney wrote:

> Mon Feb  5 10:33:15 2001  Andrew Cagney  <cagney@redhat.com>
> 
>         * config/sparc/tm-sp64.h (GDB_MULTI_ARCH): Down grade to
>         GDB_MULTI_ARCH_PARTIAL from two.  SOFTWARE_SINGLE_STEP is not
>         multi-arch.
> 
>         * gdbarch.sh (SOFTWARE_SINGLE_STEP): Add.
>         * gdbarch.h, gdbarch.c: Re-generate.
> 
>         * target.h (SOFTWARE_SINGLE_STEP_P)
>         (SOFTWARE_SINGLE_STEP): Delete macro definitions.

FYI,

I've checked this in (but with the date updated).

	Andrew