RFR: 8289208: Test DrawRotatedStringUsingRotatedFont.java occasionally crashes on MacOS [v2]

[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.

Maxim Kartashev has updated the pull request incrementally with one additional commit since the last revision:

  Made DrawRotatedStringUsingRotatedFont.java headful and dropped extra test

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Changes:
  - all: https://git.openjdk.org/jdk/pull/9362/files
  - new: https://git.openjdk.org/jdk/pull/9362/files/a1c76241..eb393c6b

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=9362&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=9362&range=00-01

  Stats: 48 lines in 2 files changed: 1 ins; 46 del; 1 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