detect special mips64le dwarf2 line number length encoding

[Alexandre Oliva]

The code that was put in to detect the special 64-bit format used by
IRIX (and mips64-linux-gnu) fails in little-endian mode, since what it
reads as the length is actually the lower 32-bit word, that is quite
likely non-zero.  This patch makes the test a bit more inclusive, such
that it can do the detection in little-endian mode.  I hope the
assumption is reasonable.  Ok to install?

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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