Eliminate access of RubyBasicObject flags #592

Job	Run time
ruby-versions / Generate Ruby versions	5s
ubuntu-24.04 2.7	43s
ubuntu-24.04 debug	27s
ubuntu-24.04 3.3	21s
ubuntu-24.04 3.2	16s
ubuntu-24.04 3.0	20s
ubuntu-24.04 3.4	15s
ubuntu-24.04 3.1	13s
ubuntu-22.04 3.3	17s
ubuntu-22.04 2.7	46s
ubuntu-24.04 jruby-head	1m 9s
ubuntu-22.04 debug	23s
ubuntu-22.04 3.1	17s
ubuntu-22.04 3.4	22s
ubuntu-22.04 truffleruby-head	26s
ubuntu-24.04 head	18s
ubuntu-24.04 truffleruby-head	26s
ubuntu-22.04 3.2	15s
ubuntu-22.04 head	14s
ubuntu-22.04 jruby-head	1m 6s
ubuntu-22.04 3.0	13s
	8m 52s

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