Fix tests with byzantium and homestead

[clonker]

• Constant Optimizer: Do not assert for shl builtin, it is guarded by dialect.evmVersion().hasBitwiseShifting().
• EVMCodeTransformTests use defaulted evm dialect instead of test-configured one: there was a mismatch between the dialect configured in the test's YulStack and what was used in the test's EVMObjectCompiler, one using the defaulted (latest) version and one the test-configured one, respectively. Also some of the code generation tests fail for byzantium and homestead if configured with the same dialect. So for now I have reverted back to default. (@cameel @rodiazet)

[cameel]

It's not wrong, but I think we'd be better off just skipping the test on unsupported versions. No need to run it multiple times if the parameters don't change.

[cameel]

Hard-coding the EVM and EOF version will not prevent the test case from being executed for all combinations, it will just make it run with the same settings every time. What we should do instead is to skip it in unsupported configurations.

One way to do this would be to check versions in the constructor and set TestCase::m_shouldRun to false for unsupported ones.

Another would be to set EVMVersion: =cancun in test cases. This is IMO something we should be doing in general because it gives us the most flexibility. All tests should be running in all configurations by default and need to be restricted explicitly as necessary. Especially in the context of EOF, this approach lets us keep it mostly disabled but still lets us enable it on a case-by-case basis. There are only ~45 cases in this suite so I think this is easily doable and I think we should go with this option.

BTW, perhaps we should think about introducing current as a valid value for EVMVersion to let us select a single version without hard-coding it. This would make this approach easier to reconcile with EVM version updates.

[clonker]

I like the idea with current. For now (and for the purpose of this PR) I have set the m_shouldRun flag, but we should do that in a follow up, imo.

[cameel]

Sounds good!