Add Profile-Guided Optimization (PGO) support to dart2native

[zamazan4ik]

Hi!

Recently I started to evaluate the Profile-Guided Optimization (PGO) state across the whole ecosystem. I did a lot of PGO measurements - all the results are available here. According to my experience, PGO helps with achieving better optimization levels in many real-world applications. That's why I think having PGO support for compiling Dart programs with dart2native is a nice feature to have.

Multiple languages already support PGO like:

• C, C++, Fortran (in Clang, GCC, MSVC, ICC)
• Rust (Rustc)
• Go (was recently added in the 1.21 release)
• Java (via GraalVM)
• C#

Also, adding PGO to dart2native was already previously mentioned in #39367 - I just decided to create a dedicated issue for it.

[mkustermann]

Also, adding PGO to dart2native was already previously mentioned in #39367 - I just decided to create a dedicated issue for it.

@zamazan4ik Thank you for filing the issue about PGO. Any reason we need 2 different github issues for this? Also notice that dart2native (aka dart compile exe/aot-snapshot) is not the only way to invoke our AOT compiler (e.g. flutter build also does invoke it). Maybe we can close this in favor of #53856?

[zamazan4ik]

Any reason we need 2 different github issues for this?

Yeah, I will explain it. #53855 is about adding a possibility to compile Dart programs with PGO using dart2native (also, as you mentioned above flutter build and probably other AoT compiler invocations). #53856 is about compiling with PGO and BOLT the DartVM itself (which is written in C++). So these are two different issues.