[code-reflection] RFR: Adjust factory constants

[Paul Sandoz]

Move and rename various op, type element, and dialect factory constants.

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Commit messages:
 - Rename dialect factory constant
 - Adjust factory constants.

Changes: https://git.openjdk.org/babylon/pull/460/files
  Webrev: https://webrevs.openjdk.org/?repo=babylon&pr=460&range=00
  Stats: 71 lines in 18 files changed: 18 ins; 22 del; 31 mod
  Patch: https://git.openjdk.org/babylon/pull/460.diff
  Fetch: git fetch https://git.openjdk.org/babylon.git pull/460/head:pull/460

PR: https://git.openjdk.org/babylon/pull/460