RFR: 8075806: divideExact is missing in java.lang.Math

[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.

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Commit messages:
 - 8075806: divideExact is missing in java.lang.Math

Changes: https://git.openjdk.java.net/jdk/pull/4770/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=4770&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8075806
  Stats: 109 lines in 2 files changed: 100 ins; 5 del; 4 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