[code-reflection] RFR: Lower StringTemplateOp [v3]

[Mourad Abbay]

> The lowering of the StringTemplateOp. We chose not to have a block for every expression body, rather blocks will be created when necessary.

Mourad Abbay has updated the pull request incrementally with one additional commit since the last revision:

  Rename J_L_LIST to J_U_LIST

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Changes:
  - all: https://git.openjdk.org/babylon/pull/39/files
  - new: https://git.openjdk.org/babylon/pull/39/files/b02575f5..2df43d24

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=babylon&pr=39&range=02
 - incr: https://webrevs.openjdk.org/?repo=babylon&pr=39&range=01-02

  Stats: 3 lines in 2 files changed: 0 ins; 0 del; 3 mod
  Patch: https://git.openjdk.org/babylon/pull/39.diff
  Fetch: git fetch https://git.openjdk.org/babylon.git pull/39/head:pull/39

PR: https://git.openjdk.org/babylon/pull/39