RFR: 8376665: Port fdlibm acosh to Java [v9]

[Anton Artemov]

> Hi, please consider the following changes:
> 
> This is a port of FDLIBM acosh method.

Anton Artemov has updated the pull request incrementally with one additional commit since the last revision:

  8376665: Fixed whitespaces.

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

Changes:
  - all: https://git.openjdk.org/jdk/pull/29488/files
  - new: https://git.openjdk.org/jdk/pull/29488/files/e50c546a..13218df6

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=29488&range=08
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=29488&range=07-08

  Stats: 7 lines in 1 file changed: 0 ins; 0 del; 7 mod
  Patch: https://git.openjdk.org/jdk/pull/29488.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/29488/head:pull/29488

PR: https://git.openjdk.org/jdk/pull/29488