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Speed up rebuilding the loaded feature index
Rebuilding the loaded feature index slowed down with the bug fix for #17885 in 79a4484. The slowdown was extreme if realpath emulation was used, but even when not emulated, it could be about 10x slower. This adds loaded_features_realpath_map to rb_vm_struct. This is a hidden hash mapping loaded feature paths to realpaths. When rebuilding the loaded feature index, look at this hash to get cached realpath values, and skip calling rb_check_realpath if a cached value is found. Fixes [Bug #19246]
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