RFR: JDK-8327487: Further augment WorstCaseTests with more cases

[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.

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Commit messages:
 - JDK-8327487: Further augment WorstCaseTests with more cases

Changes: https://git.openjdk.org/jdk/pull/18140/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=18140&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8327487
  Stats: 56 lines in 1 file changed: 56 ins; 0 del; 0 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