RFR: 8273346: Expand library mappings to IEEE 754 operations [v2]

[Joe Darcy]

> Generally add apiNote's to map from Java library methods to particular IEEE 754 operations. For now, I only added such notes to java.lang.Math and not java.lang.StrictMath.

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 four additional commits since the last revision:

 - Respond to review feedback; make another pass to link methods to IEEE 754 operations.
 - Merge branch 'master' into JDK-8273346
 - Add floor and ceil.
 - JDK-8273346: Examine use of "rounding mode" and "rounding policy" in Math and StrictMath

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Changes:
  - all: https://git.openjdk.java.net/jdk/pull/8876/files
  - new: https://git.openjdk.java.net/jdk/pull/8876/files/050e6ecd..9169ad9e

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=8876&range=01
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=8876&range=00-01

  Stats: 46471 lines in 566 files changed: 22606 ins; 17922 del; 5943 mod
  Patch: https://git.openjdk.java.net/jdk/pull/8876.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/8876/head:pull/8876

PR: https://git.openjdk.java.net/jdk/pull/8876