mips n32/n64 mcount ABI change

[Alexandre Oliva]

Since there's no known working gprof support for n32 and n64, and
we're just about to get the first one in mips64-linux, Chris Demetriou
suggested us to get rid of a historical ugliness in the mcount ABI.
Traditionally, its caller has to push two words onto the stack, that
mcount will just pop.  Since there's no good reason to do it on
n32/n64, we went ahead and got rid of it.  Approved by Eric
Christopher.  Installing in mainline.

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-- 
Alexandre Oliva   Enjoy Guarana', see http://www.ic.unicamp.br/~oliva/
Red Hat GCC Developer                 aoliva@{redhat.com, gcc.gnu.org}
CS PhD student at IC-Unicamp        oliva@{lsd.ic.unicamp.br, gnu.org}
Free Software Evangelist                Professional serial bug killer