The main goal here is to avoid making JNI calls from code that really
shouldn't need JNI (e.g. before this patch, ArrayList.add called
Math.max, which called Math.<clinit>, which called Random.<init>,
which called System.currentTimeMillis).
Besides following the "pay for only what you need" principle, this
change ensures we can call LambdaMetaFactory methods during AOT
compilation with a minimal VM (i.e. without compiling in JNI methods
we don't need).
Previously, I used a shell script to extract modification date ranges
from the Git history, but that was complicated and unreliable, so now
every file just gets the same year range in its copyright header. If
someone needs to know when a specific file was modified and by whom,
they can look at the Git history themselves; no need to include it
redundantly in the header.
