RFR: 8261660: AArch64: Race condition in stub code generation for LSE Atomics

[Andrew Haley]

Temporary fix for race condition.

There's a narrow race condition in the code which generates LSE Atomic stubs and enables them for use by the runtime. DIsable LSE stub generation for now.

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Commit messages:
 - Committed

Changes: https://git.openjdk.java.net/jdk/pull/2553/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=2553&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8261660
  Stats: 2 lines in 1 file changed: 2 ins; 0 del; 0 mod
  Patch: https://git.openjdk.java.net/jdk/pull/2553.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/2553/head:pull/2553

PR: https://git.openjdk.java.net/jdk/pull/2553