RFR: JDK-8302026: Port fdlibm inverse trig functions (asin, acos, atan) to Java

[Joe Darcy]

Proceeding down the line of FDLIBM functions to be ported, next up are asin, acos, and atan.

Diffs of the various versions will follow in a separate message.

There were no unusual coding idioms encountered in porting these methods.

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Commit messages:
 - Appease jcheck.
 - Add regression test.
 - Switch to hex literals, misc. updates.
 - Update exhausting tests.
 - Merge branch 'master' into JDK-8302026
 - Reformat test.
 - Merge branch 'master' into JDK-8302026
 - JDK-8302026: Port fdlibm inverse trig functions (asin, acos, atan) to Java

Changes: https://git.openjdk.org/jdk/pull/12545/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=12545&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8302026
  Stats: 1041 lines in 6 files changed: 1034 ins; 0 del; 7 mod
  Patch: https://git.openjdk.org/jdk/pull/12545.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/12545/head:pull/12545

PR: https://git.openjdk.org/jdk/pull/12545