[code-reflection] RFR: BytecodeGenerator, BytecodeLift and TestBytecode improvements [v2]

[Adam Sotona]

> BytecodeGenerator, BytecodeLift and TestBytecode improvements

Adam Sotona has updated the pull request incrementally with one additional commit since the last revision:

  return type conversion moved from Interpreter to TestBytecode

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

Changes:
  - all: https://git.openjdk.org/babylon/pull/44/files
  - new: https://git.openjdk.org/babylon/pull/44/files/37e7f7fa..b6d833c7

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=babylon&pr=44&range=01
 - incr: https://webrevs.openjdk.org/?repo=babylon&pr=44&range=00-01

  Stats: 34 lines in 2 files changed: 19 ins; 12 del; 3 mod
  Patch: https://git.openjdk.org/babylon/pull/44.diff
  Fetch: git fetch https://git.openjdk.org/babylon.git pull/44/head:pull/44

PR: https://git.openjdk.org/babylon/pull/44