RFR: [type-classes] JDK-8376823: Add prototype polynomial class [v2]

[Joe Darcy]

> Add a simple polynomial class over doubles as an example of a ring.

Joe Darcy has updated the pull request incrementally with one additional commit since the last revision:

  Updates.

-------------

Changes:
  - all: https://git.openjdk.org/valhalla/pull/2004/files
  - new: https://git.openjdk.org/valhalla/pull/2004/files/5f006a55..51a16f30

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=valhalla&pr=2004&range=01
 - incr: https://webrevs.openjdk.org/?repo=valhalla&pr=2004&range=00-01

  Stats: 39 lines in 1 file changed: 38 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/valhalla/pull/2004.diff
  Fetch: git fetch https://git.openjdk.org/valhalla.git pull/2004/head:pull/2004

PR: https://git.openjdk.org/valhalla/pull/2004