New badness metric for inliner

[David Miller]

This broke the bootstrap on sparc:

/home/davem/src/GIT/GCC/build-sparc32-linux/./prev-gcc/g++ -B/home/davem/src/GIT/GCC/build-sparc32\
-linux/./prev-gcc/ -B/usr/local/sparc-unknown-linux-gnu/bin/ -nostdinc++ -B/home/davem/src/GIT/GCC\
/build-sparc32-linux/prev-sparc-unknown-linux-gnu/libstdc++-v3/src/.libs -B/home/davem/src/GIT/GCC\
/build-sparc32-linux/prev-sparc-unknown-linux-gnu/libstdc++-v3/libsupc++/.libs -I/home/davem/src/G\
IT/GCC/build-sparc32-linux/prev-sparc-unknown-linux-gnu/libstdc++-v3/include/sparc-unknown-linux-g\
nu -I/home/davem/src/GIT/GCC/build-sparc32-linux/prev-sparc-unknown-linux-gnu/libstdc++-v3/include\
 -I/home/davem/src/GIT/GCC/gcc/libstdc++-v3/libsupc++ -L/home/davem/src/GIT/GCC/build-sparc32-linu\
x/prev-sparc-unknown-linux-gnu/libstdc++-v3/src/.libs -L/home/davem/src/GIT/GCC/build-sparc32-linu\
x/prev-sparc-unknown-linux-gnu/libstdc++-v3/libsupc++/.libs -c   -g -O2 -gtoggle -DIN_GCC   -fno-e\
xceptions -fno-rtti -fasynchronous-unwind-tables -W -Wall -Wno-narrowing -Wwrite-strings -Wcast-qu\
al -Wmissing-format-attribute -pedantic -Wno-long-long -Wno-variadic-macros -Wno-overlength-string\
s -Werror -fno-common  -DHAVE_CONFIG_H -I. -I. -I../../gcc/gcc -I../../gcc/gcc/. -I../../gcc/gcc/.\
./include -I../../gcc/gcc/../libcpp/include  -I../../gcc/gcc/../libdecnumber -I../../gcc/gcc/../li\
bdecnumber/dpd -I../libdecnumber -I../../gcc/gcc/../libbacktrace -DCLOOG_INT_GMP    ../../gcc/gcc/\
graphite-interchange.c -o graphite-interchange.o
../../gcc/gcc/graphite-interchange.c:645:1: internal compiler error: in relative_time_benefit, at \
ipa-inline.c:784
 }
 ^
0x10bcf1b relative_time_benefit
        ../../gcc/gcc/ipa-inline.c:784
0x10bd583 edge_badness
        ../../gcc/gcc/ipa-inline.c:894
0x10bdcdf update_edge_key
        ../../gcc/gcc/ipa-inline.c:962
0x10be68b update_callee_keys
        ../../gcc/gcc/ipa-inline.c:1141
0x10c00f7 inline_small_functions
        ../../gcc/gcc/ipa-inline.c:1594
0x10c0aa7 ipa_inline
        ../../gcc/gcc/ipa-inline.c:1769
Please submit a full bug report,
with preprocessed source if appropriate.
Please include the complete backtrace with any bug report.
See <http://gcc.gnu.org/bugs.html> for instructions.
make[3]: *** [graphite-interchange.o] Error 1