RFR: 8260461: Modernize jsr166 tck tests

[Martin Buchholz]

8260461: Modernize jsr166 tck tests

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Commit messages:
 - JDK-8260461

Changes: https://git.openjdk.java.net/jdk/pull/2245/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=2245&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8260461
  Stats: 7535 lines in 70 files changed: 314 ins; 183 del; 7038 mod
  Patch: https://git.openjdk.java.net/jdk/pull/2245.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/2245/head:pull/2245

PR: https://git.openjdk.java.net/jdk/pull/2245