[v634][meta] Correct TClass::LoadClassInfo. #18787
Merged
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This fixes #18556.
We should keep trying to try to load a ClassInfo until we try the auto-parsing. TClass::LoadClassInfo should set fCanLoadClassInfo to false when the ClassInfo is found and set it to false also when we tried auto parsing but did not find the ClassInfo.
In the later case, the ClassInfo might still be loaded if information about the class is later loaded/parsed.
Backport of #18587