Ruby

Support narrowing for if (y = x) assignment in condition #1401

Job	Run time
ruby-versions / Generate Ruby versions	4s
build (3.4)	1m 0s
build (4.0)	44s
build (3.3)	1m 1s
build (head)	42s
build (truffleruby)	35s
	4m 6s

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