[code-reflection] RFR: Committing a Concatenation transformation to StringBuilder [v2]

[Ian Graves]

> A transformation that converts String Concatenation to StringBuilder for uses in lowering to Bytecode.

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

  Updates and refactorings

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Changes:
  - all: https://git.openjdk.org/babylon/pull/135/files
  - new: https://git.openjdk.org/babylon/pull/135/files/14105ce8..729de59d

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=babylon&pr=135&range=01
 - incr: https://webrevs.openjdk.org/?repo=babylon&pr=135&range=00-01

  Stats: 260 lines in 4 files changed: 82 ins; 166 del; 12 mod
  Patch: https://git.openjdk.org/babylon/pull/135.diff
  Fetch: git fetch https://git.openjdk.org/babylon.git pull/135/head:pull/135

PR: https://git.openjdk.org/babylon/pull/135