RFR: 8258800: Deprecate -XX:+AlwaysLockClassLoader

[Coleen Phillimore]

Tested manually and with tier1-3.  This option isn't in any of the tests.

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Commit messages:
 - 8258800: Deprecate -XX:+AlwaysLockClassLoader

Changes: https://git.openjdk.java.net/jdk/pull/1931/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=1931&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8258800
  Stats: 3 lines in 2 files changed: 1 ins; 0 del; 2 mod
  Patch: https://git.openjdk.java.net/jdk/pull/1931.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/1931/head:pull/1931

PR: https://git.openjdk.java.net/jdk/pull/1931