RFR: 8250635: MethodArityHistogram should use Compile_lock in favour of fancy checks

[Lutz Schmidt]

This change was already fully reviewed before the Mercurial to Git transition.
Reviewed-by: thartmann (TobiHartmann), mdoerr (TheRealMDoerr).

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Commit messages:
 - JDK-8250635 tranferred from Mercurial

Changes: https://git.openjdk.java.net/jdk/pull/321/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=321&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8250635
  Stats: 6 lines in 1 file changed: 3 ins; 0 del; 3 mod
  Patch: https://git.openjdk.java.net/jdk/pull/321.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/321/head:pull/321

PR: https://git.openjdk.java.net/jdk/pull/321