[Bug math/20495] SIMD sincosf implementation lacks VEX encoded version

["kungfujesus06 at gmail dot com" <sourceware-bugzilla at sourceware dot org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=20495

--- Comment #4 from Adam Stylinski <kungfujesus06 at gmail dot com> ---
It may help to increase the iterations a bit more by modifying numvals to be
200*9000 or so.

After doing that, even with -O3, it's clear we're hitting that penalty:

adam@eggsbenedict ~ $ gcc -mavx test_sincos.c -o test.out -lm -O3
adam@eggsbenedict ~ $ time ./test.out 

real    0m0.174s
user    0m0.171s
sys     0m0.002s
adam@eggsbenedict ~ $ gcc -msse4 test_sincos.c -o test.out -lm -O3
adam@eggsbenedict ~ $ time ./test.out 

real    0m0.069s
user    0m0.064s
sys     0m0.004s

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