[code-reflection] RFR: Concat Transform Optimizations [v4]

[Ian Graves]

> Updates to the transformation on Concats to StringBuilder that reduce redundant "new" StringBuilders while respecting correctness.

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

  Integrating Paul's tree-based approach with argument handling

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Changes:
  - all: https://git.openjdk.org/babylon/pull/149/files
  - new: https://git.openjdk.org/babylon/pull/149/files/0ae8001e..7d966a45

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=babylon&pr=149&range=03
 - incr: https://webrevs.openjdk.org/?repo=babylon&pr=149&range=02-03

  Stats: 123 lines in 1 file changed: 18 ins; 66 del; 39 mod
  Patch: https://git.openjdk.org/babylon/pull/149.diff
  Fetch: git fetch https://git.openjdk.org/babylon.git pull/149/head:pull/149

PR: https://git.openjdk.org/babylon/pull/149