Ruby

Support RBS::AST::Members::InstanceVariable #1117

Job	Run time
ruby-versions / Generate Ruby versions	3s
build (3.2)	45s
build (3.3)	45s
build (3.4)	45s
build (head)	43s
build (truffleruby)	34s
build (truffleruby-head)	38s
	4m 13s

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