Add CRYPTO_sysrand benchmarks to speed.cc

[andrewhop]

Description of changes:

Add two new benchmarks by refactoring the existing RNG benchmark to support multiple functions.

Call-outs:

Looking at the tree DRBG PR got me interested in the performance impact of calling CRYPTO_sysrand. These benchmarks will be very OS dependent.

Testing:

On an M1 mac:

./tool/bssl speed -filter RNG
Did 2572000 RNG (16 bytes) operations in 1000160us (2571588.5 ops/sec): 41.1 MB/s
Did 2323000 RNG (256 bytes) operations in 1000233us (2322458.9 ops/sec): 594.5 MB/s
Did 1714000 RNG (1350 bytes) operations in 1000052us (1713910.9 ops/sec): 2313.8 MB/s
Did 631000 RNG (8192 bytes) operations in 1000242us (630847.3 ops/sec): 5167.9 MB/s
Did 360000 RNG (16384 bytes) operations in 1001003us (359639.3 ops/sec): 5892.3 MB/s

./tool/bssl speed -filter CRYPTO_sys
Did 4014000 CRYPTO_sysrand (16 bytes) operations in 1000088us (4013646.8 ops/sec): 64.2 MB/s
Did 3459000 CRYPTO_sysrand (256 bytes) operations in 1000071us (3458754.4 ops/sec): 885.4 MB/s
Did 1703000 CRYPTO_sysrand (1350 bytes) operations in 1000478us (1702186.4 ops/sec): 2298.0 MB/s
Did 397000 CRYPTO_sysrand (8192 bytes) operations in 1000532us (396788.9 ops/sec): 3250.5 MB/s
Did 200000 CRYPTO_sysrand (16384 bytes) operations in 1000393us (199921.4 ops/sec): 3275.5 MB/s
Did 4041000 CRYPTO_sysrand_for_seed (16 bytes) operations in 1000045us (4040818.2 ops/sec): 64.7 MB/s
Did 3404500 CRYPTO_sysrand_for_seed (256 bytes) operations in 1000055us (3404312.8 ops/sec): 871.5 MB/s
Did 1663250 CRYPTO_sysrand_for_seed (1350 bytes) operations in 1000120us (1663050.4 ops/sec): 2245.1 MB/s
Did 387000 CRYPTO_sysrand_for_seed (8192 bytes) operations in 1002271us (386123.1 ops/sec): 3163.1 MB/s
Did 198000 CRYPTO_sysrand_for_seed (16384 bytes) operations in 1000206us (197959.2 ops/sec): 3243.4 MB/s

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license and the ISC license.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 78.77%. Comparing base (fa1c6c0) to head (51aac86).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1978   +/-   ##
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  Coverage   78.77%   78.77%           
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  Files         590      590           
  Lines      101506   101506           
  Branches    14398    14400    +2     
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+ Hits        79963    79965    +2     
+ Misses      20907    20905    -2     
  Partials      636      636           

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