Change compiler tests without additional VM flags from @run driver to @run main

There are a lot of compiler tests which are currently using `@run driver myclass` when no additional VM flag must be set. However, this completely disables any flag passing by -javaoptions or -vmoptions. As a consequence, the CI will never execute the test with other flag combinations.

The better alternative is to use `@run main myclass` which still allows us to pass flags from the outside to the test, for example by the CI.