[code-reflection] RFR: Adding String Concatenation to Code Model [v2]

[Ian Graves]

> Adding String concatenation to the code model and interpreter.

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

  Updates and cleanup

-------------

Changes:
  - all: https://git.openjdk.org/babylon/pull/47/files
  - new: https://git.openjdk.org/babylon/pull/47/files/76bc3134..d401f54a

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=babylon&pr=47&range=01
 - incr: https://webrevs.openjdk.org/?repo=babylon&pr=47&range=00-01

  Stats: 12 lines in 2 files changed: 0 ins; 4 del; 8 mod
  Patch: https://git.openjdk.org/babylon/pull/47.diff
  Fetch: git fetch https://git.openjdk.org/babylon.git pull/47/head:pull/47

PR: https://git.openjdk.org/babylon/pull/47