Add new benchmark for getivar with T_CLASS and T_MODULE #1520

Job	Run time
benchmark-ractor (head)	12m 17s
benchmark-default (head)	10m 43s
benchmark-graph	50s
benchmark-ractor-only (head)	48s
benchmark-ractor (ruby)	12m 48s
benchmark-default (truffleruby)	15m 39s
benchmark-default (ruby)	11m 12s
benchmark-ractor-only (ruby)	1m 2s
test (truffleruby)	57s
benchmark-run-once	1m 33s
test (ruby)	54s
test (head)	58s
all-tests	2s
	1h 9m 43s

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