gcj -fprofile-arcs segfaults

[Alexandre Oliva]

unsigned_type_node is not defined by the Java front end, so coverage.c
shouldn't reference it directly.  This patch fixes it, hopefully
without breaking anything.  I'm not sufficiently familiar with gcov to
tell whether the potential type change introduced by this change could
break anything.

Regression-tested by running check-gcc check-g++ with
RUNTESTFLAGS=gcov.exp on amd64-linux-gnu, both -m64 and -m32.

Ok to install?

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-- 
Alexandre Oliva         http://www.lsd.ic.unicamp.br/~oliva/
Secretary for FSF Latin America        http://www.fsfla.org/
Red Hat Compiler Engineer   aoliva@{redhat.com, gcc.gnu.org}
Free Software Evangelist  oliva@{lsd.ic.unicamp.br, gnu.org}