Eagerly defrost chilled strings #349

Job	Run time
ruby-versions / Generate Ruby versions	5s
ubuntu-22.04 2.7	34s
ubuntu-22.04 3.0	9s
ubuntu-22.04 3.1	9s
ubuntu-22.04 3.2	10s
ubuntu-22.04 3.3	15s
ubuntu-22.04 debug	22s
ubuntu-22.04 head	9s
ubuntu-22.04 jruby-head	1m 1s
ubuntu-22.04 truffleruby-head	23s
ubuntu-20.04 2.7	34s
ubuntu-20.04 3.0	15s
ubuntu-20.04 3.1	11s
ubuntu-20.04 3.2	10s
ubuntu-20.04 3.3	10s
ubuntu-20.04 debug	23s
ubuntu-20.04 head	8s
ubuntu-20.04 jruby-head	51s
ubuntu-20.04 truffleruby-head	23s
	6m 22s

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