Integrated: Left in debug code.

[Coleen Phillimore]

Make print_owned_locks debug-only to fix the build.  Sorry about the pull request email - it's what I'm used to.

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Commit messages:
 - Left in debug code.

Changes: https://git.openjdk.java.net/loom/pull/50/files
 Webrev: https://webrevs.openjdk.java.net/?repo=loom&pr=50&range=00
  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.java.net/loom/pull/50.diff
  Fetch: git fetch https://git.openjdk.java.net/loom pull/50/head:pull/50

PR: https://git.openjdk.java.net/loom/pull/50