Make std-benchmarks/benchOnly Startup work

[JaroslavTulach]

Pull Request Description

Adjustments to #8378 to make sure it runs with std-benchmarks/benchOnly Startup.

Checklist

Please ensure that the following checklist has been satisfied before submitting the PR:

• All code follows the style guides.
• All code has been tested:
  • Benchmarks really measure the startup

[JaroslavTulach]

Previously the benchmark created the Enso file on the fly - do you know that by default the BenchProcessor runs the Enso code in "design" execution environment - e.g. writing into temporary file doesn't change its content?

To mitigate that I created Empty_World.enso and Hello_World.enso in the repository.

[JaroslavTulach]

Benchmarks finally seem to run. The base results are:

• Startup.empty_startup - takes 2716ms
• Startup.hello_world_startu takes 3968ms

that means the overhead of the engine runtime (and JVM runtime) is currently 2.7s - then there is another 1.2s overhead associated with processing standard library.

Btw. one can built:

sbt:enso> engine-runner/buildNativeImage

and then execute time ./runner --run test/Benchmarks/src/Startup/Empty_World.enso - the result is 163ms. E.g. we have a way to reduce those 2.7s to 163ms which would get the whole startup below 1.5s.