Make many fields on Ruby final. #5992
Merged
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Many recent JITs have started to optimize repeat final field
accesses. This patch moves almost all core class and module init
into the Ruby constructor, so that those fields (as well as some
structural references) can be made final. This should help any
core classes that look up their own type on each construction
(which includes almost all of them) when those constructors are
inlined together with other accesses of the same field.