Fix the `instance_size` field for upgraded classes.

gnustep / libobjc2

Objective-C runtime library intended for use with Clang.

http://www.gnustep.org/

MIT License

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Fix the `instance_size` field for upgraded classes. #240

Closed davidchisnall closed 1 year ago

davidchisnall commented 1 year ago

The instance size was being reported incorrectly which meant that associated objects looked for a reference list slightly after the end of the object.

Fixes #228