Add DH_check support to perf tool

[torben-hansen]

Description of changes:

Makes it possible to measure performance of the function DH_check().

Call-outs:

Generating DH parameters for higher bit sizes gets pretty slow.

Testing:

$ ./tool/bssl speed -filter dhcheck -timeout 10 -primes 2048,4096
DH check speed test is very slow. Speed test works best with higher timeouts.
Did 16 DH check(s) (2048 bits) operations in 10164348us (1.574 ops/sec)
Did 3 DH check(s) (4096 bits) operations in 15465898us (0.194 ops/sec)

$ ./tool/bssl speed -filter dhcheck -timeout 2 -primes 1024 -json
[
{"description": "DH check(s)", "numCalls": 20, "microseconds": 2045047, "primeSizePerCall": 1024}
]

Checking new -chuncks and -primes parsing

$ ./tool/bssl speed -filter EVP-AES-128-GCM -chunks 20,50,56
Did 5489000 EVP-AES-128-GCM encrypt init operations in 1000135us (5488259.1 ops/sec)
Did 10318000 EVP-AES-128-GCM encrypt (20 bytes) operations in 1000012us (10317876.2 ops/sec): 206.4 MB/s
Did 9833000 EVP-AES-128-GCM encrypt (50 bytes) operations in 1000011us (9832891.8 ops/sec): 491.6 MB/s
Did 9841000 EVP-AES-128-GCM encrypt (56 bytes) operations in 1000018us (9840822.9 ops/sec): 551.1 MB/s
Did 5481000 EVP-AES-128-GCM decrypt init operations in 1000071us (5480610.9 ops/sec)
Did 10456000 EVP-AES-128-GCM decrypt (20 bytes) operations in 1000013us (10455864.1 ops/sec): 209.1 MB/s
Did 10318500 EVP-AES-128-GCM decrypt (50 bytes) operations in 1000013us (10318365.9 ops/sec): 515.9 MB/s
Did 10318500 EVP-AES-128-GCM decrypt (56 bytes) operations in 1000007us (10318427.8 ops/sec): 577.8 MB/s


$ ./tool/bssl speed -filter EVP-AES-128-GCM -chunks 20,50,56
Did 5487000 EVP-AES-128-GCM encrypt init operations in 1000077us (5486577.5 ops/sec)
Did 10589000 EVP-AES-128-GCM encrypt (20 bytes) operations in 1000083us (10588121.2 ops/sec): 211.8 MB/s
Did 10230000 EVP-AES-128-GCM encrypt (50 bytes) operations in 1000024us (10229754.5 ops/sec): 511.5 MB/s
Did 10228250 EVP-AES-128-GCM encrypt (56 bytes) operations in 1000001us (10228239.8 ops/sec): 572.8 MB/s
Did 5497250 EVP-AES-128-GCM decrypt init operations in 1000019us (5497145.6 ops/sec)
Did 11285000 EVP-AES-128-GCM decrypt (20 bytes) operations in 1000073us (11284176.3 ops/sec): 225.7 MB/s
Did 11094000 EVP-AES-128-GCM decrypt (50 bytes) operations in 1000021us (11093767.0 ops/sec): 554.7 MB/s
Did 11095000 EVP-AES-128-GCM decrypt (56 bytes) operations in 1000021us (11094767.0 ops/sec): 621.3 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.