Fix SourceFinder's constant evaluation issue #3290

Job	Run time
lint	10s
ruby-versions / Generate Ruby versions	2s
vterm-yamatanooroti 2.7 (latest reline)	1m 2s
rake test 2.7 (latest reline)	1m 20s
vterm-yamatanooroti 2.7	1m 0s
rake test 2.7	1m 6s
vterm-yamatanooroti 3.0 (latest reline)	1m 21s
rake test 3.0 (latest reline)	1m 10s
vterm-yamatanooroti 3.0	59s
rake test 3.0	1m 9s
vterm-yamatanooroti 3.1 (latest reline)	1m 21s
vterm-yamatanooroti 3.1	54s
rake test 3.1 (latest reline)	1m 9s
vterm-yamatanooroti 3.2 (latest reline)	52s
rake test 3.1	1m 9s
vterm-yamatanooroti 3.2	1m 13s
rake test 3.2 (latest reline)	1m 0s
vterm-yamatanooroti 3.3 (latest reline)	52s
rake test 3.2	1m 4s
vterm-yamatanooroti 3.3	52s
rake test 3.3 (latest reline)	1m 15s
vterm-yamatanooroti head (latest reline)	56s
rake test 3.3	1m 10s
vterm-yamatanooroti head	55s
rake test head (latest reline)	1m 6s
rake test head	1m 7s
rake test truffleruby-head (latest reline)	2m 36s
rake test truffleruby-head	2m 53s
	31m 43s

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