[PATCH]: R10000 Needs LL/SC Workaround in Gcc

[Kumba]

The attached patch adds a workaround to have gcc emit branch likely instructions 
(beqzl) in atomic operations for R10000 CPUs.  This is because revisions of this 
CPU before 3.0 misbehave, while revisions 2.6 and earlier will deadlock.  This 
issue has been noted on SGI IP28 (Indigo2 Impact R10000) systems and SGI IP27 
Origin systems.

After creating a patch to glibc based off of Debian Bug #462112 
(http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=462112), it was suggested by 
David Daney that a similar patch be created for GCC.

Feedback would be welcome on any suggestions for improving this patch (please 
CC, as I'm not subscribed to the ML).

Thanks!

-- 
Joshua Kinard
Gentoo/MIPS
kumba@gentoo.org

"The past tempts us, the present confuses us, the future frightens us.  And our 
lives slip away, moment by moment, lost in that vast, terrible in-between."

--Emperor Turhan, Centauri Republic
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