gzip performance test

[David Edelsohn]

	gzip built with which options?  gzip-1.2.4a CFLAGS seems to
default to -O.

	I tried gzip-1.2.4a on powerpc-ibm-aix4.3.3.0.  The results depend
on the options:

With -O2, gcc-3.0 prerelease is slightly faster, matching your results.
With -O3 -funroll-all-loops, gcc-2.95 is slightly faster.
With -O3 -funroll-all-loops -fstrict-aliasing, they're statistically
identical. 

David