Remove back pointer from Real to VALUE #438

Job	Run time
ruby-versions / Generate Ruby versions	4s
ubuntu-latest 2.7	1m 6s
ubuntu-latest 3.0	36s
ubuntu-latest 3.1	36s
ubuntu-latest 3.2	34s
ubuntu-latest 3.3	36s
ubuntu-latest 3.4	33s
ubuntu-latest debug	48s
ubuntu-latest head	35s
macos-latest 2.7	57s
macos-latest 3.0	24s
macos-latest 3.1	30s
macos-latest 3.2	24s
macos-latest 3.3	20s
macos-latest 3.4	26s
macos-latest debug	27s
macos-latest head	23s
macos-14 2.7	56s
macos-14 3.0	25s
macos-14 3.1	28s
macos-14 3.2	24s
macos-14 3.3	21s
macos-14 3.4	21s
macos-14 debug	27s
macos-14 head	23s
windows-latest 2.7	6m 27s
windows-latest 3.3	3m 10s
windows-latest 3.4	3m 39s
windows-latest head	3m 45s
windows-latest mingw	3m 21s
windows-latest mswin	2m 13s
	35m 39s

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