Use Profile-Guided Optimization (PGO) for the compiler itself

Hi!

Since the compiler is to be rewritten in Go, I suggest considering using the Profile-Guided Optimization (PGO) option to optimize the Typescript compiler itself. Go supports PGO since 1.20 so it's an available option for the project. PGO for compiler-like workloads works especially well - e.g. check my PGO benchmarks for compilers (even if most of are for non-Go projects, the results should be pretty the same for Go since it uses the same ideas).

I suggest you the following plan:

• Perform PGO benchmarks for the compiler. It will require thinking about the training workload - I think compiling any Typescript project would be a good option for most of the use-cases
• Providing some scripts for simplifying building the compiler with PGO
• Integrating PGO optimization step into the CI pipeline so end-users will get a PGO-optimized version of the compiler.

I understand that the project is in its early-stages and probably there are more important things to finish at the moment. If this is true, just consider the issue as a point of improvement for the future versions. I believe that improving the compiler performance is a valuable-enough things for the end-users.

Thank you.

P.S. If you think that Discussions is a better place for such issues - feel free to move it there.

まず Go 1.20 の PGO ドキュメントと、コンパイラの現在の build および CI のエントリポイントを確認します。代表的な TypeScript のトレーニングワークロードを確立し、PGO をベースラインと比較して、CI 統合によって測定可能な効果が得られるかを評価します。この issue では、特定のファイルやテストは指定されていません。