RFR: 8317538: Potential bottleneck in Provider::getService: specjvm2008::crypto.rsa have scalability issue for high vCPU numbers

[Vladimir Ivanov]

This patch remove access to the shared variable to fix scalability issue in the multithread environment. According to testing by the specjvm2008::crypto.rsa the one thread performance reduced for less than 1% while the score for the multithread run increased in ~2x. For the 2 socket system with Xeon 8480+ numbers looks as:
•	1 thread: 643.15 for original version vs 642.54 for patched one;
•	224 threads: 22446.19 for original vs 46147.41 for patched.
The RSABench microbenchmark reports no score changes for the 1 thread (average for all testcases) and 2.4% improvement for the 224 threads.

-------------

Commit messages:
 - 8317538: Potential bottleneck in Provider::getService: specjvm2008::crypto.rsa have scalability issue for high vCPU numbers

Changes: https://git.openjdk.org/jdk/pull/21719/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=21719&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8317538
  Stats: 15 lines in 1 file changed: 0 ins; 14 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/21719.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/21719/head:pull/21719

PR: https://git.openjdk.org/jdk/pull/21719