RFR: 8075806: divideExact is missing in java.lang.Math [v5]

[Brian Burkhalter]

> Please consider this proposal to add `divideExact()` methods for integral data types to `java.lang.Math` thereby rounding out "exact" support to all four basic arithmetic operations.

Brian Burkhalter has updated the pull request incrementally with one additional commit since the last revision:

  8075806: Clean up division by zero verbiage

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Changes:
  - all: https://git.openjdk.java.net/jdk/pull/4770/files
  - new: https://git.openjdk.java.net/jdk/pull/4770/files/328e4188..5093a2e8

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=4770&range=04
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=4770&range=03-04

  Stats: 16 lines in 2 files changed: 4 ins; 0 del; 12 mod
  Patch: https://git.openjdk.java.net/jdk/pull/4770.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/4770/head:pull/4770

PR: https://git.openjdk.java.net/jdk/pull/4770