Doug Gregor 4d39506c4a [IRGen] Use a more precise computation for the kind of reference count. ...

TypeBase::usesNativeReferenceCounting() was doing a lot of work to
find the class that a type refers to, then determine whether it
would use the native reference-counting scheme. Its primary caller
in IRGen would use an overly-conservative approximation to decide
between the “Objective-C” and “unknown” cases, which resulted in
uses of “unknown” reference counting for some obviously-ObjC cases
(e.g., values of “NSObject”).

Moreover, the approximation would try to call into the type checker
(because it relied unnecessarily on the superclass *type* of a class
declaration), causing an assertion.

Fixes rdar://problem/42828798.

2018-08-06 17:04:47 -07:00

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