RFR: 8271225: Add floorDivExact() method to java.lang.[Strict]Math [v3]

[Brian Burkhalter]

> Add methods `floorDivExact(int,int)` and `floorDivExact(long,long)` to `java.lang.Math` and `java.lang.StrictMath`.

Brian Burkhalter has updated the pull request with a new target base due to a merge or a rebase. The pull request now contains five commits:

 - 8271225: Verbiage update after 8271599
 - Merge
 - 8271225: Revert drive-by verbiage updates
 - 8271225: Some verbiage updates
 - 8271225: Add floorDivExact() method to java.lang.[Strict]Math

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Changes: https://git.openjdk.java.net/jdk/pull/4941/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=4941&range=02
  Stats: 205 lines in 3 files changed: 202 ins; 0 del; 3 mod
  Patch: https://git.openjdk.java.net/jdk/pull/4941.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/4941/head:pull/4941

PR: https://git.openjdk.java.net/jdk/pull/4941