* Initial support for VM_CALL_ARGS_SPLAT This implements support for calls with splat (*) for some methods. In benchmarks this made very little difference for most benchmarks, but a large difference for binarytrees. Looking at side exits, many benchmarks now don't exit for splat, but exit for some other reason. Binarytrees however had a number of calls that used splat args that are now much faster. In my non-scientific benchmarking this made splat args performance on par with not using splat args at all. * Fix wording and whitespace Co-authored-by: Maxime Chevalier-Boisvert <[email protected]> * Get rid of side_effect reassignment Co-authored-by: Maxime Chevalier-Boisvert <[email protected]>