RFR: JDK-8327487: Further augment WorstCaseTests with more cases [v3]

[Joe Darcy]

> The atan2 and hypot cases added would fail for a particular test library that has errors in the millions of ulps for those inputs, rather than the small number of ulps specified for the error.

Joe Darcy has updated the pull request incrementally with one additional commit since the last revision:

  Implement review feedback.

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Changes:
  - all: https://git.openjdk.org/jdk/pull/18140/files
  - new: https://git.openjdk.org/jdk/pull/18140/files/6b2d7870..67df3748

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=18140&range=02
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=18140&range=01-02

  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/18140.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/18140/head:pull/18140

PR: https://git.openjdk.org/jdk/pull/18140