Fix a performance regression introduced by freezing support. #2609
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In particular, this has been found whenever codebase uses freeze a lot, for instance opal compiled by opal. In addition, this fixes a possible performance problem of codebases that use `instance_variables` method. Co-authored-by: Jan Biedermann <jan@kursator.de>
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In particular, this has been found whenever codebase uses freeze a lot, for instance opal compiled by opal.
In addition, this fixes a possible performance problem of codebases that use
instance_variablesmethod.