perf: precompile contracts for faster test runs

[jaypaik]

Motivation

IR compilation of the entire project takes a long time. When excluding the test suite however, the time cuts down dramatically. It would be nice to compile just the source contracts via IR and the test suite without. However, there's currently no way (in Foundry) to specify different profiles or different compilation configuration for specific files in a build.

Solution

The approach taken here is inspired by https://github.com/ProjectOpenSea/seaport. I've created a profile optimized-build for the purpose of precompiling just the source contracts via IR into the folder out-optimized. When tests are run under the optimized-test or optimized-test-deep profiles, the project is built again without IR, but the relevant source contracts are deployed using the optimized bytecode from out-optimized so the tests can test against the bytecode that is actually to be deployed.

I've updated the CI workflow to remove the lite test in favor of using the optimized test. It should be fast enough now that we don't need the early signal provided by the lite profile.

Before (3m 59s)	After (58s)

Please let me know if you see any flaws with this!

[adam-alchemy]

Nice! This is awesome, and really clever solution.

One thing to add: I think we should keep the non-IR tests in the CI, even if we're not using the deep profile (though we could). In the past, we once had a test case that passed with non-IR but failed with IR, which is the opposite direction of what this would catch but just shows that it is possible for these differences to exist. I think in that case it was due to unsafe memory accesses in assembly, which creates undefined behavior.

Also had a small comment re: bytecode_hash

[fangting-alchemy]

Is this the line that skips building tests contract?

[jaypaik]

Yup! The alternative is to use --skip test, but that ends up compiling files in the test directory that do not end in t.sol.