RFR: 8261280: Remove THREAD argument from compute_loader_lock_object

[Coleen Phillimore]

Hopefully trivial.  Ran tier1-3.

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Commit messages:
 - 8261280: Remove THREAD argument from compute_loader_lock_object

Changes: https://git.openjdk.java.net/jdk/pull/2446/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=2446&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8261280
  Stats: 12 lines in 3 files changed: 0 ins; 3 del; 9 mod
  Patch: https://git.openjdk.java.net/jdk/pull/2446.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/2446/head:pull/2446

PR: https://git.openjdk.java.net/jdk/pull/2446