[8u] RFR: 8268427: Improve AlgorithmConstraints:checkAlgorithm performance

[Alexey Bakhtin]

Hello all,

Could you please review a backport of AlgorithmConstraints:checkAlgorithm performance enhancement to JDK8u

JBS: https://bugs.openjdk.java.net/browse/JDK-8268427
Webrev: https://cr.openjdk.java.net/~abakhtin/8268427/webrev.v0/
11u patch: https://github.com/openjdk/jdk11u-dev/commit/4e324294d2940aa7ebaf51723fd4bc5178442b15

11u patch applies clean except of the following:
1) JDK8u does not have JDK-8215281: "Use String.isEmpty() when applicable in java.base” [1] enhancement, so the AbstractAlgorithmConstraints.java is not applied clean. Trivial merge around "algorithm.length() == 0” line of code.
2) Original code contains micro-benchmark which is not supported by JDK8. Benchmark is converted to the manual test

JDK8u results before patch:
Algorithm   Nanos
SSLv3       8.889
DES       102.397
NULL      176.476
TLS1.3    642.859

JDK8u results after patch:
Algorithm   Nanos
SSLv3      53.205
DES        36.405
NULL       26.642
TLS1.3    168.395

JDK11u results for reference:
Algorithm   Nanos
SSLv3      48.563
DES        32.336
NULL       22.696
TLS1.3    194.921

No regression in the sun/security tests.

Regards
Alexey

[1] - https://bugs.openjdk.java.net/browse/JDK-8215281