Eager load bucket constants #1666

Job	Run time
rubocop	13s
tests (ubuntu-latest, 2.7)	26s
tests (ubuntu-latest, 3.0)	10s
tests (ubuntu-latest, 3.1)	10s
tests (ubuntu-latest, 3.2)	10s
tests (ubuntu-latest, head)	1m 4s
tests (ubuntu-latest, truffleruby-22.2)	2m 10s
tests (ubuntu-latest, truffleruby-22.3)	1m 51s
tests (ubuntu-latest, truffleruby-head)	1m 56s
tests (macos-latest, 2.7)	1m 16s
tests (macos-latest, 3.0)	25s
tests (macos-latest, 3.1)	25s
tests (macos-latest, 3.2)	20s
tests (macos-latest, head)	1m 45s
tests (macos-latest, truffleruby-22.2)	5m 27s
tests (macos-latest, truffleruby-22.3)	7m 17s
tests (macos-latest, truffleruby-head)	3m 13s
	28m 18s

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