[patch] passes.c: Run CSE only once after GCSE instead of twice or more.

[Kazu Hirata]

Hi Richard,

> I always use my tramp3d-v3 testcase to beat compilers into ground :)
> It's fetchable from
> http://www.tat.physik.uni-tuebingen.de/~rguenth/gcc/tramp3d-v3.cpp.gz

Thanks for the link.  Unfortunately, GCC generates the same assmebly
code for tramp3d with or without my patch, so I cannot use this to do
run-time performance comparison.

By the way, here is a timing in seconds for three runs of

  ./cc1plus -qiet -fno-random-seed -O2 -o /dev/null tramp3d-v3.ii

      original patched   diff%
user   132.193 130.740 -1.099%
real   130.636 128.853 -1.364%

I'll try POOMA.

Kazu Hirata