Cache parsed object names #561

Job	Run time
Ruby memcheck	44s
ruby-versions / Generate Ruby versions	3s
ubuntu-22.04 2.7	1m 9s
ubuntu-22.04 3.0	28s
ubuntu-22.04 3.1	34s
ubuntu-22.04 3.2	29s
ubuntu-22.04 3.3	29s
ubuntu-22.04 head	1m 32s
ubuntu-22.04 jruby	1m 9s
ubuntu-22.04 jruby-head	1m 13s
macos-13 2.7	2m 40s
macos-13 3.0	35s
macos-13 3.1	40s
macos-13 3.2	37s
macos-13 3.3	39s
macos-13 head	27s
macos-13 jruby	1m 22s
macos-13 jruby-head	1m 24s
macos-14 2.7	1m 1s
macos-14 3.0	22s
macos-14 3.1	38s
macos-14 3.2	24s
macos-14 3.3	22s
macos-14 head	17s
macos-14 jruby	56s
macos-14 jruby-head	41s
windows-latest 2.7	5m 7s
windows-latest 3.0	1m 58s
windows-latest 3.1	2m 27s
windows-latest 3.2	2m 30s
windows-latest 3.3	3m 55s
windows-latest head	1m 54s
windows-latest mswin	1m 30s
ubuntu-latest jruby-9.4	1m 10s
macos-latest truffleruby-head	55s
ubuntu-latest truffleruby-head	1m 56s
	44m 17s

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