[SH] Broken build due to tree.h not being included anymore

[Steven Bosscher]

On Sun, Jul 8, 2012 at 5:43 PM, Oleg Endo <oleg.endo@t-online.de> wrote:
> Hello,
>
> The recent change that removed the inclusion of tree.h in several places
> broke the SH target in one place in sh.md, where stuff from tree.h was
> used directly.  I've moved those lines in question into a new function
> in sh.c.

I suppose some breakage was to be expected. I tried auditing all .md
files for usages of things defined in tree.h but I overlooked this
one. Sorry!

> Tested with make all-gcc.
>
> OK to install?

I can't approve it, but it looks obvious enough.

Ciao!
Steven