[jdk11u-dev] RFR: 8262316: Reducing locks in RSA Blinding

[Evgeny Astigeevich]

We have users hit by locks in RSA Blinding when multiple threads are used. This backport fixes the performance issue.
The patch applies clearly. Tier 1 and 2 passed.

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Commit messages:
 - Backport 7a99a9874b3f803baf24fec3b59e1975fc51ed1b

Changes: https://git.openjdk.java.net/jdk11u-dev/pull/473/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk11u-dev&pr=473&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8262316
  Stats: 80 lines in 1 file changed: 37 ins; 17 del; 26 mod
  Patch: https://git.openjdk.java.net/jdk11u-dev/pull/473.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk11u-dev pull/473/head:pull/473

PR: https://git.openjdk.java.net/jdk11u-dev/pull/473