Initial support for VM_CALL_ARGS_SPLAT (#6341)

* 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 <maximechevalierb@gmail.com>

* Get rid of side_effect reassignment

Co-authored-by: Maxime Chevalier-Boisvert <maximechevalierb@gmail.com>

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