Eliminate access of RubyBasicObject flags #593

Job	Run time
ruby-versions / Generate Ruby versions	4s
ubuntu-24.04 2.7	43s
ubuntu-24.04 3.0	18s
ubuntu-24.04 3.3	22s
ubuntu-24.04 3.2	19s
ubuntu-24.04 3.4	16s
ubuntu-24.04 truffleruby-head	33s
ubuntu-22.04 3.2	23s
ubuntu-24.04 debug	27s
ubuntu-22.04 2.7	42s
ubuntu-24.04 3.1	14s
ubuntu-24.04 jruby-head	1m 16s
ubuntu-22.04 truffleruby-head	36s
ubuntu-22.04 3.0	19s
ubuntu-22.04 jruby-head	1m 16s
ubuntu-22.04 3.1	20s
ubuntu-24.04 head	15s
ubuntu-22.04 3.3	17s
ubuntu-22.04 3.4	21s
ubuntu-22.04 debug	30s
ubuntu-22.04 head	14s
	9m 45s

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