[meta] Correct TClass::LoadClassInfo. #18587
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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 tofalse when the ClassInfois 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 (via a different
routine/mechanims) if information about the class is later loaded/parsed.