RFR: 8338529: Initial iteration of numerics modeling interfaces [v4]

[Joe Darcy]

> A refinement of some earlier ideas on the numerics modeling interfaces to inform further discussions.
> 
> This is a "lumpy" rather than "splitty" design in terms of favoring a smaller number of interfaces with more functionality rather than a larger number of interfaces making smaller distinctions.
> 
> Various design comments and to-do's noted in the code.

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

  Add apiNote on closure under different operations, etc.

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Changes:
  - all: https://git.openjdk.org/valhalla/pull/1917/files
  - new: https://git.openjdk.org/valhalla/pull/1917/files/1a1713ec..7620d79d

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=valhalla&pr=1917&range=03
 - incr: https://webrevs.openjdk.org/?repo=valhalla&pr=1917&range=02-03

  Stats: 53 lines in 1 file changed: 33 ins; 7 del; 13 mod
  Patch: https://git.openjdk.org/valhalla/pull/1917.diff
  Fetch: git fetch https://git.openjdk.org/valhalla.git pull/1917/head:pull/1917

PR: https://git.openjdk.org/valhalla/pull/1917