Eagerly defrost chilled strings #358

Job	Run time
ruby-versions / Generate Ruby versions	4s
ubuntu-22.04 2.7	38s
ubuntu-22.04 3.0	11s
ubuntu-22.04 3.1	11s
ubuntu-22.04 3.2	10s
ubuntu-22.04 3.3	14s
ubuntu-22.04 debug	24s
ubuntu-22.04 head	13s
ubuntu-22.04 jruby-head	58s
ubuntu-22.04 truffleruby-head	22s
ubuntu-20.04 2.7	33s
ubuntu-20.04 3.0	10s
ubuntu-20.04 3.1	11s
ubuntu-20.04 3.2	9s
ubuntu-20.04 3.3	8s
ubuntu-20.04 debug	22s
ubuntu-20.04 head	10s
ubuntu-20.04 jruby-head	1m 3s
ubuntu-20.04 truffleruby-head	25s
	6m 36s

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