RFR: JDK-8301833: Add wide-ranging tests for FDLIBM porting [v3]

[Joe Darcy]

> To help add assurances that the main-line port of FDLIBM to Java is working correctly, added some long-running manual tests to probe that the transliteration port and the corresponding StrictMath method are in agreement on a large number of argument, say, all float values.
> 
> To test the transliteration port, this test can be run against a build where the JDK has *not* had the FDLIBM code used for StrictMath ported to Java.

Joe Darcy has updated the pull request with a new target base due to a merge or a rebase. The incremental webrev excludes the unrelated changes brought in by the merge/rebase. The pull request contains six additional commits since the last revision:

 - Include log testing.
 - Merge branch 'master' into JDK-8301833
 - Update test.
 - Merge branch 'master' into JDK-8301833
 - Added trailing line terminator.
 - JDK-8301833: Add manual tests for FDLIBM porting

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

Changes:
  - all: https://git.openjdk.org/jdk/pull/12430/files
  - new: https://git.openjdk.org/jdk/pull/12430/files/89c4c658..b5f22449

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=12430&range=02
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=12430&range=01-02

  Stats: 583 lines in 7 files changed: 513 ins; 0 del; 70 mod
  Patch: https://git.openjdk.org/jdk/pull/12430.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/12430/head:pull/12430

PR: https://git.openjdk.org/jdk/pull/12430