Greg Parker c677a5dc11 [IRGen][runtime] Prepare to change the is-Swift bit in class metadata. (#13595) ...

Swift class metadata has a bit to distinguish it from non-Swift Objective-C
classes. The stable ABI will use a different bit so that stable Swift and
pre-stable Swift can be distinguished from each other.

No bits are actually changed yet. Enabling the new bit needs to wait for
other coordination such as libobjc.

rdar://35767811

2017-12-22 00:52:00 -08:00

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