[jdk11u-dev] RFR: 8273026: Slow LoginContext.login() on multi threading application [v3]

[Larry-N]

> Backport of performance enhancement. Tested with tier-2.

Larry-N has updated the pull request incrementally with two additional commits since the last revision:

 - corrections in .gitignore
 - Revert "Delete .gitignore"
   
   This reverts commit b49f2df4fcd38240842820e7a35a9041d79ae956.

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Changes:
  - all: https://git.openjdk.java.net/jdk11u-dev/pull/572/files
  - new: https://git.openjdk.java.net/jdk11u-dev/pull/572/files/b49f2df4..98ea1b8d

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk11u-dev&pr=572&range=02
 - incr: https://webrevs.openjdk.java.net/?repo=jdk11u-dev&pr=572&range=01-02

  Stats: 15 lines in 1 file changed: 15 ins; 0 del; 0 mod
  Patch: https://git.openjdk.java.net/jdk11u-dev/pull/572.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk11u-dev pull/572/head:pull/572

PR: https://git.openjdk.java.net/jdk11u-dev/pull/572