RFR: 8271602: Add Math.ceilDiv() family parallel to Math.floorDiv() family

[Raffaello Giulietti]

This PR ideally continues #5285, which has been closed as a consequence of inadvertently removing the branch on my repo. See there for initial discussion.

Sorry for the mess.

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Commit messages:
 - 8271602: Add Math.ceilDiv() family parallel to Math.floorDiv() family

Changes: https://git.openjdk.java.net/jdk/pull/5341/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=5341&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8271602
  Stats: 1093 lines in 4 files changed: 1040 ins; 0 del; 53 mod
  Patch: https://git.openjdk.java.net/jdk/pull/5341.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/5341/head:pull/5341

PR: https://git.openjdk.java.net/jdk/pull/5341