RFR: 8289208: Test DrawRotatedStringUsingRotatedFont.java occasionally crashes on MacOS

[Maxim Kartashev]

Java2D's `Disposer` maintains a record of objects to dispose of with the help of a collection that isn't thread safe. When `DisposerRecords` objects are being added to it at the same time as others are being disposed on the Toolkit thread, chaos ensues.

This commit replaces the collection with a thread-safe  one, more consistently guards against exceptions in individual disposers, and adds exception's stacktraces printing in order to facilitate said exceptions' debugging, which are otherwise hard to pinpoint without code modification. 

Originally, the bug was caught on MacOS running an existing test (`DrawRotatedStringUsingRotatedFont`) that would occasionally crash the VM (probably due to double-free detected by libc that abort()'s in this case). It may take many re-tries to reproduce and this wasn't  observed on Linux. The new test (`test/jdk/sun/java2d/Disposer/TestDisposerRace.java`) displays the problem in a more reliable fashion and fails both on MacOS and Linux without this fix.

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Commit messages:
 - 8289208: Test DrawRotatedStringUsingRotatedFont.java occasionally crashes on MacOS

Changes: https://git.openjdk.org/jdk/pull/9362/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=9362&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8289208
  Stats: 185 lines in 3 files changed: 165 ins; 5 del; 15 mod
  Patch: https://git.openjdk.org/jdk/pull/9362.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/9362/head:pull/9362

PR: https://git.openjdk.org/jdk/pull/9362