Doug Gregor 350391db9d [ABI] Use associated type descriptors for generic parameter references. ...

Generic parameter references, which occur in generic requirement
metadata, were hardcoding associated type indices. Instead, use
relative references to associated type descriptors and perform the
index calculation at runtime.

Associated types can now be reordered resiliently (without relying on 
sorting), which is the first main step toward rdar://problem/44167982.

2018-09-14 20:59:03 -07:00

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