RFR: JDK-8302026: Port fdlibm inverse trig functions (asin, acos, atan) to Java [v2]

[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.

Joe Darcy has updated the pull request incrementally with two additional commits since the last revision:

 - Add asin test case.
 - Refactor regression tests.

-------------

Changes:
  - all: https://git.openjdk.org/jdk/pull/12545/files
  - new: https://git.openjdk.org/jdk/pull/12545/files/688f44ba..e8195463

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=12545&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=12545&range=00-01

  Stats: 176 lines in 1 file changed: 34 ins; 82 del; 60 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