tools.jar from JDK has different public api on different platforms which
makes impossible to reuse caches for tasks which depend on it. Since we
can't compile against those classes & stay cross-platform anyway, we
may just exclude them from compile classpath. This should make tools.jar
compatible at least within one build of JDK for different platforms
This option has no effect on the production code. But in a custom
scenario of a local bootstrap, where the compiler is replaced with the
one where JVM IR backend is enabled by default, this option allows to
switch back to the old backend.
All of these arguments (except the one for compiling experimental
coroutines) are supposed to go away as soon as we fix related problems
in the JVM IR backend.
Vitaliy.Bibaev