The only remaining user of is_same_frag() was the function recursively calling
itself.

Different from earlier gcc versions, gcc 4.3 detects and warns about this fact,
which leads due to -Werror to the following build error:

<--  snip  -->

...
gcc -DHAVE_CONFIG_H -I. -I/TMP/binutils-2.18.50.0.5/gas -I. -I.
-I/TMP/binutils-2.18.50.0.5/gas -I../bfd -I/TMP/binutils-2.18.50.0.5/gas/config
-I/TMP/binutils-2.18.50.0.5/gas/../include -I/TMP/binutils-2.18.50.0.5/gas/..
-I/TMP/binutils-2.18.50.0.5/gas/../bfd
-DLOCALEDIR="\"/usr/local/DIR/binutils-hppa-2.18.50.0.5/share/locale\""   -W
-Wall -Wstrict-prototypes -Wmissing-prototypes -Werror -O2 -march=k8 -c
/TMP/binutils-2.18.50.0.5/gas/config/tc-hppa.c
cc1: warnings being treated as errors
/TMP/binutils-2.18.50.0.5/gas/config/tc-hppa.c:5905: error: ‘is_same_frag’
defined but not used
make[4]: *** [tc-hppa.o] Error 1

<--  snip  -->