Note that I've called out a couple of suspicious places where we
are requesting abstract metadata for superclasses but probably
need to be requesting something more complete.
Currently ignored, but this will allow future compilers to pass down source location information for cast
failure runtime errors without backward deployment constraints.
This is a funnel point for looking up the protocol conformance descriptor
for a given conforming type + conformance. Make it overridable in case we
need to back-deploy changes or fixes.
Implements rdar://problem/46281660.
Rename the funnel points for demangling strings/nodes to metadata to
swift_getTypeByMangled(Name|Node) and make them overridable. This will let
us back-deploy mangling improvements and bug fixes.
Simplify the signature of the internal _getTypeByMangledName() used by the
standard library to what we actually (currently) use. Drop it as a
compatibility override, because it’s not a useful place to introduce
customization.
