RFR: 8268727: Remove unused slowpath locking method in OptoRuntime

[Miao Zheng]

8268727: Remove unused slowpath locking method in OptoRuntime

-------------

Commit messages:
 - 8268727: Remove unused slowpath locking method in OptoRuntime

Changes: https://git.openjdk.java.net/jdk/pull/4490/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=4490&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8268727
  Stats: 5 lines in 2 files changed: 0 ins; 4 del; 1 mod
  Patch: https://git.openjdk.java.net/jdk/pull/4490.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/4490/head:pull/4490

PR: https://git.openjdk.java.net/jdk/pull/4490