[WIP See what fails] - Nullness bugfix - change isObjTy early returns in ConstraintSolver #17757
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Fixes #17737 .
The callsites for isObjTyAnyNullness are all still to be manually reviewed case by case, there might be more errors hidden in them.
Expected to see several older tests fail with mismatches, the change should introduce a few more warnings now.