RFR: 8376665: Port fdlibm acosh to Java [v5]

[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.

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Changes:
  - all: https://git.openjdk.org/jdk/pull/29488/files
  - new: https://git.openjdk.org/jdk/pull/29488/files/32e51c37..702c955f

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=29488&range=04
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=29488&range=03-04

  Stats: 38 lines in 2 files changed: 1 ins; 0 del; 37 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