[code-reflection] RFR: Assert code modeling [v3]

[Ian Graves]

> Initial work on the code model for supporting assertions. This PR contains the code model. A subsequent PR will include interpreter updates to execute assertions in IR form.

Ian Graves has updated the pull request incrementally with one additional commit since the last revision:

  Updates to CoreOps.

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Changes:
  - all: https://git.openjdk.org/babylon/pull/32/files
  - new: https://git.openjdk.org/babylon/pull/32/files/bd85950d..c70a9781

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=babylon&pr=32&range=02
 - incr: https://webrevs.openjdk.org/?repo=babylon&pr=32&range=01-02

  Stats: 6 lines in 1 file changed: 1 ins; 1 del; 4 mod
  Patch: https://git.openjdk.org/babylon/pull/32.diff
  Fetch: git fetch https://git.openjdk.org/babylon.git pull/32/head:pull/32

PR: https://git.openjdk.org/babylon/pull/32