[jdk11u-dev] RFR: 7107615: scalability bloker in javax.crypto.JceSecurity

[olivergillespie]

Clean backport of https://github.com/openjdk/jdk/commit/74d45e481d1ad6aa5d7c6315ea86681e1a978ce0
which addresses https://bugs.openjdk.java.net/browse/JDK-7107615.
The improved performance is useful for me and I expect many other people.

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Commit messages:
- Backport 74d45e481d1ad6aa5d7c6315ea86681e1a978ce0

Changes: https://git.openjdk.java.net/jdk11u-dev/pull/690/files
Webrev: https://webrevs.openjdk.java.net/?repo=jdk11u-dev&pr=690&range=00
Issue: https://bugs.openjdk.java.net/browse/JDK-7107615
Stats: 64 lines in 1 file changed: 34 ins; 0 del; 30 mod
Patch: https://git.openjdk.java.net/jdk11u-dev/pull/690.diff
Fetch: git fetch https://git.openjdk.java.net/jdk11u-dev pull/690/head:pull/690

PR: https://git.openjdk.java.net/jdk11u-dev/pull/690