Remove back pointer from Real to VALUE #439

Job	Run time
ruby-versions / Generate Ruby versions	2s
ubuntu-latest 2.7	1m 4s
ubuntu-latest 3.0	33s
ubuntu-latest 3.1	33s
ubuntu-latest 3.2	37s
ubuntu-latest 3.3	35s
ubuntu-latest 3.4	32s
ubuntu-latest debug	43s
ubuntu-latest head	34s
macos-latest 2.7	55s
macos-latest 3.0	24s
macos-latest 3.1	31s
macos-latest 3.2	23s
macos-latest 3.3	21s
macos-latest 3.4	21s
macos-latest debug	26s
macos-latest head	22s
macos-14 2.7	1m 2s
macos-14 3.0	24s
macos-14 3.1	28s
macos-14 3.2	27s
macos-14 3.3	21s
macos-14 3.4	20s
macos-14 debug	33s
macos-14 head	28s
windows-latest 2.7	5m 19s
windows-latest 3.3	3m 28s
windows-latest 3.4	3m 29s
windows-latest head	3m 10s
windows-latest mingw	3m 7s
windows-latest mswin	2m 23s
	33m 55s

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