Erik Eckstein e8e613bd6a RCIdentity: fix another case of not-RC-identity-preserving casts. ...

When casting from existentials to class - and vice versa - it can happen that a cast is not RC identity preserving (because of potential bridging).
This also affects mayRelease() of such cast instructions.
For details see the comments in SILDynamicCastInst::isRCIdentityPreserving().

This change also includes some refactoring: I centralized the logic in SILDynamicCastInst::isRCIdentityPreserving().

rdar://problem/70454804

2020-10-28 08:10:41 +01:00

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