[code-reflection] RFR: Descriptor to reference [v2]

[Paul Sandoz]

> Refactor `{Method, Field, RecordType}Desc` to `{Method, Field, RecordType}Ref` and move them to the `types` package. Remove the `descriptor` package. Replace usages of the noun `descriptor` (except for now, in the context of reflective operations).

Paul Sandoz has updated the pull request incrementally with one additional commit since the last revision:

  Rename record component desc to ref

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Changes:
  - all: https://git.openjdk.org/babylon/pull/33/files
  - new: https://git.openjdk.org/babylon/pull/33/files/6a1fd461..61e21e5d

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=babylon&pr=33&range=01
 - incr: https://webrevs.openjdk.org/?repo=babylon&pr=33&range=00-01

  Stats: 14 lines in 4 files changed: 0 ins; 0 del; 14 mod
  Patch: https://git.openjdk.org/babylon/pull/33.diff
  Fetch: git fetch https://git.openjdk.org/babylon.git pull/33/head:pull/33

PR: https://git.openjdk.org/babylon/pull/33