Adding a libgcc file

[Paul Koning]

Question about proper target maintainer procedures...

The pdp11 target needs udivhi3 in libgcc.  There's udivsi3, and it's really easy to tweak those files for HImode.  And that works.

Should I add the HI files to the libgcc directory, or under config/pdp11?  There's nothing target specific about them, though I don't know of other targets that might want this.

And would this change fall under target maintainer write privileges, or should I get the patch reviewed first?

	paul