RFR: 8317538: Potential bottleneck in Provider::getService: specjvm2008::crypto.rsa have scalability issue for high vCPU numbers [v2]

[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.

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Changes:
  - all: https://git.openjdk.org/jdk/pull/21622/files
  - new: https://git.openjdk.org/jdk/pull/21622/files/23f94ebd..37aa320f

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=21622&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=21622&range=00-01

  Stats: 15 lines in 1 file changed: 14 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/21622.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/21622/head:pull/21622

PR: https://git.openjdk.org/jdk/pull/21622