Add AVX-512 argsort for 32 and 64-bit data type

[r-devulap]

Benchmarks on SKX, using gcc-10

Benchmark                                                                Time             CPU      Time Old      Time New       CPU Old       CPU New
-----------------------------------------------------------------------------------------------------------------------------------------------------
[stdargsort vs. avx512argsort]/random_10000/int64_t                   -0.8039         -0.8039        671022        131555        671011        131552
[stdargsort vs. avx512argsort]/random_100000/int64_t                  -0.7735         -0.7735       9132790       2068415       9132791       2068396
[stdargsort vs. avx512argsort]/sorted_10000/int64_t                   -0.2738         -0.2738        161350        117166        161346        117165
[stdargsort vs. avx512argsort]/constant_10000/int64_t                 -0.9238         -0.9238        121882          9284        121882          9284
[stdargsort vs. avx512argsort]/reverse_10000/int64_t                  -0.0570         -0.0570        125358        118218        125356        118216
[stdargsort vs. avx512argsort]/random_10000/uint64_t                  -0.8079         -0.8079        675553        129807        675547        129805
[stdargsort vs. avx512argsort]/random_100000/uint64_t                 -0.7708         -0.7708       9137299       2094234       9137106       2094173
[stdargsort vs. avx512argsort]/sorted_10000/uint64_t                  -0.2775         -0.2775        162269        117240        162267        117239
[stdargsort vs. avx512argsort]/constant_10000/uint64_t                -0.9235         -0.9235        121851          9318        121851          9318
[stdargsort vs. avx512argsort]/reverse_10000/uint64_t                 -0.0460         -0.0460        124036        118325        124033        118323
[stdargsort vs. avx512argsort]/random_10000/double                    -0.8052         -0.8052        646944        125994        646939        125992
[stdargsort vs. avx512argsort]/random_100000/double                   -0.7640         -0.7640       8695430       2052490       8695360       2052433
[stdargsort vs. avx512argsort]/sorted_10000/double                    -0.1498         -0.1498        132678        112805        132676        112804
[stdargsort vs. avx512argsort]/constant_10000/double                  -0.9074         -0.9074        100607          9316        100607          9316
[stdargsort vs. avx512argsort]/reverse_10000/double                   +0.1744         +0.1744         97526        114535         97524        114535
OVERALL_GEOMEAN                                                       -0.6905         -0.6905             0             0             0             0

[r-devulap]

Added argsort for 32-bit data type too:

[stdargsort vs. avx512argsort]/random_10000/int32_t                   -0.8300         -0.8300        614181        104408        614164        104405
[stdargsort vs. avx512argsort]/random_100000/int32_t                  -0.7895         -0.7896       8029899       1689909       8029731       1689805
[stdargsort vs. avx512argsort]/sorted_10000/int32_t                   -0.0827         -0.0827        101969         93540        101966         93536
[stdargsort vs. avx512argsort]/constant_10000/int32_t                 -0.9003         -0.9003         82221          8200         82220          8200
[stdargsort vs. avx512argsort]/reverse_10000/int32_t                  +0.1666         +0.1666         80752         94207         80751         94203
[stdargsort vs. avx512argsort]/random_10000/uint32_t                  -0.8234         -0.8234        590935        104352        590911        104349
[stdargsort vs. avx512argsort]/random_100000/uint32_t                 -0.7801         -0.7801       7722846       1698556       7722673       1698450
[stdargsort vs. avx512argsort]/sorted_10000/uint32_t                  -0.0702         -0.0702        101269         94158        101265         94157
[stdargsort vs. avx512argsort]/constant_10000/uint32_t                -0.9137         -0.9137         94859          8183         94857          8182
[stdargsort vs. avx512argsort]/reverse_10000/uint32_t                 +0.1674         +0.1674         81350         94970         81350         94968
[stdargsort vs. avx512argsort]/random_10000/float                     -0.8137         -0.8137        627568        116926        627547        116923
[stdargsort vs. avx512argsort]/random_100000/float                    -0.7821         -0.7821       8399273       1830312       8398849       1830205
[stdargsort vs. avx512argsort]/sorted_10000/float                     -0.1257         -0.1257        119299        104307        119295        104304
[stdargsort vs. avx512argsort]/constant_10000/float                   -0.9218         -0.9218        105474          8249        105472          8249
[stdargsort vs. avx512argsort]/reverse_10000/float                    +0.1315         +0.1315         92251        104383         92250        104382
OVERALL_GEOMEAN                                                       -0.6830         -0.6830             0             0             0             0