Renames GatherersTest to BuiltInGatherersTest for easier deduplication of GathererTest.
Fixes a test ordering issue in testMapConcurrentAPIandContract(). Adding increased maxOutputSize for Gatherer-related tests to improve debuggability. Lowering the composition threshold of GathererTest.testMassivelyComposedGatherers to 256 to avoid SOE on low-specc:ed machines. ------------- Commit messages: - Stabilization of GatherersTest and renaming it Changes: https://git.openjdk.org/jdk/pull/16928/files Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=16928&range=00 Issue: https://bugs.openjdk.org/browse/JDK-8321124 Stats: 761 lines in 5 files changed: 391 ins; 369 del; 1 mod Patch: https://git.openjdk.org/jdk/pull/16928.diff Fetch: git fetch https://git.openjdk.org/jdk.git pull/16928/head:pull/16928 PR: https://git.openjdk.org/jdk/pull/16928
