TLS support for MIPS

[Eric Christopher]

> > We already have separate operators for things like R_MIPS_CALL_HI16 and
> > R_MIPS_CALL_LO16, namely %call_hi() and %call_lo()[*].  I think it'd be
> > simpler and more consistent to have %dtpoff_hi() and %dtpoff_lo()
> > instead.  You'd then be able to get rid of hackery like:
> 
> I cribbed this approach from PowerPC (@tprel@ha) because it seemed
> eminently sensible.  If you'd prefer to use single operators instead,
> then I guess I can crib from a different architecture instead.
> 

It is fairly sensible, however, it doesn't really fit like we've been
going. Cribbing from alpha would probably work.


> OK.  At this point I think that means renaming the relocations; I just
> renamed the operators more sanely recently.  Anyone have a preference
> on the TPREL vs. TPOFF conventions?
> 

I prefer rel, but that's possibly just my bias.

-eric