[code-reflection] RFR: Assert code modeling [v2]

[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:

  Additional assert test for one body

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Changes:
  - all: https://git.openjdk.org/babylon/pull/32/files
  - new: https://git.openjdk.org/babylon/pull/32/files/a279e927..bd85950d

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=babylon&pr=32&range=01
 - incr: https://webrevs.openjdk.org/?repo=babylon&pr=32&range=00-01

  Stats: 17 lines in 1 file changed: 17 ins; 0 del; 0 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