[PATCH] testsuite: skip morestack.exp in sparc targets

[Jose E. Marchesi]

    > +# This test does not work on targets for which -fsplit-stack is not
    > +# supported.
    > +if { [istarget sparc*-*-linux-gnu] } {
    > +    return
    > +}
    > +
    >  if [get_compiler_info] {
    >      return -1
    >  }
    
    It might be simpler just to enable for the targets that do support
    -fsplit-stack:
    
    if { ![istarget i?86-*-*] && ![istarget x86_64-*-* ] } {
      return
    }

Yes, much better.  I wasn't sure about other archs :)
Could someone apply this change?