swift

33cd990f - SILGen: Guard against unexpected nulls passed into ObjC overrides.

SILGen: Guard against unexpected nulls passed into ObjC overrides. We want to treat arguments to ObjC override and protocol conformance thunks like "call results", since they might be called from ObjC code that doesn't fulfill its nullability promises in practice. Fixes SR-7240 | rdar://problem/38675815.