[code-reflection] RFR: OpBuilder optimizations - part 1. [v2]

[Adam Sotona]

> This PR include following changes:
> 
> - op-building methods isolated from the original code and moved to a synthetic inner class
> - fixed boxing in `OpBuilder`
> - op-building methods are generated by `BytecodeGenerator` and support wide range of ops
> - `CodeModelTranslator` is deleted
> - synthetic op-building method overrides significantly reduce overhead (by 60% on `TestBytecode`)
> 
> Remaining tasks:
> 
> - implement part 2. type-building helper method(s) to reduce the overhead even more
> - refactor `OpBuilder` to build `ModuleOp` instead of individual `FuncOp`s (and re-enable `TestCodeBuilder`)
> - cleanup `BytecodeGenerator` API

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

  nit fixes

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

Changes:
  - all: https://git.openjdk.org/babylon/pull/679/files
  - new: https://git.openjdk.org/babylon/pull/679/files/4b7a1eca..50e01fdf

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=babylon&pr=679&range=01
 - incr: https://webrevs.openjdk.org/?repo=babylon&pr=679&range=00-01

  Stats: 2 lines in 1 file changed: 0 ins; 1 del; 1 mod
  Patch: https://git.openjdk.org/babylon/pull/679.diff
  Fetch: git fetch https://git.openjdk.org/babylon.git pull/679/head:pull/679

PR: https://git.openjdk.org/babylon/pull/679