[Bug default/24965] [dwz] Faster hashing using native insns

["vries at gcc dot gnu.org" <sourceware-bugzilla@sourceware.org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=24965

--- Comment #1 from Tom de Vries <vries at gcc dot gnu.org> ---
Created attachment 11975
  --> https://sourceware.org/bugzilla/attachment.cgi?id=11975&action=edit
Add --native-hash

This patch modifies crc32c-intel.patch to make the functionality
off-by-default, and available using a command line option --native-hash.

A first experiment with dwz-ing a cc1 binary, show ~10% speed improvement:
...
$ ../measure/experiment.sh
cmd: ./dwz -L100000000 -l100000000 cc1 -o cc1.dwz
1/10
2/10
3/10
4/10
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cmd: ./dwz -L100000000 -l100000000 --native-hash cc1 -o cc1.dwz
1/10
2/10
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4/10
5/10
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9/10
10/10
real:
series:  9040 7073 7184 7060 7071 7149 6987 7120 7062 7095
mean:  7284.10 (100%)
stddev:  619.31
series:  6434 6442 6458 6580 6363 6374 6372 6369 6461 6422
mean:  6427.50 (88.24%)
stddev:  65.93
user:
series:  7320 6876 6886 6912 6902 6886 6830 6947 6916 6912
mean:  6938.70 (100%)
stddev:  137.46
series:  6265 6258 6269 6323 6214 6220 6208 6208 6237 6261
mean:  6246.30 (90.02%)
stddev:  36.30
sys:
series:  399 196 292 148 168 252 156 172 144 180
mean:  210.70 (100%)
stddev:  81.39
series:  168 184 188 252 148 152 164 160 220 160
mean:  179.60 (85.24%)
stddev:  33.12
...

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