Eliminate access of RubyBasicObject flags #591

Job	Run time
ruby-versions / Generate Ruby versions	4s
ubuntu-24.04 3.0	21s
ubuntu-24.04 3.2	18s
ubuntu-24.04 2.7	46s
ubuntu-24.04 head	3m 19s
ubuntu-24.04 truffleruby-head	38s
ubuntu-22.04 2.7	47s
ubuntu-24.04 jruby-head	1m 22s
ubuntu-24.04 3.3	20s
ubuntu-22.04 3.2	25s
ubuntu-24.04 3.4	17s
ubuntu-22.04 3.3	24s
ubuntu-22.04 3.4	15s
ubuntu-22.04 debug	23s
ubuntu-24.04 debug	29s
ubuntu-24.04 3.1	15s
ubuntu-22.04 3.0	13s
ubuntu-22.04 head	17s
ubuntu-22.04 jruby-head	1m 15s
ubuntu-22.04 3.1	19s
ubuntu-22.04 truffleruby-head	37s
	13m 4s

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