MIPS SIZE_TYPE and PTRDIFF_TYPE revamp

[Alexandre Oliva]

And here's a complement to that patch, that fixes the setting of
LONG_MAX such that it agrees with the compiler's internal notion of
the width of a long.  There were some divergences, particularly when
using -mgp32 and -mlong64 together.  This patch, approved by Eric
Christopher, addresses these problems, such that, on that same MIPS
port, the number of C++ failures goes down significantly, and newlib
gets a correct implementation of strchr().  It's optimized to walk the
string long by long, so an incorrect setting of LONG_MAX causes it to
fail in some corner cases, which is great.

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