swift

c868e05f - [SIL] Unify default witness table entries with witness table entries.

[SIL] Unify default witness table entries with witness table entries. SILWitnessTable::Entry already contains a superset of what was supported by SILDefaultWitnessTable::Entry, the latter of which only had “no entry” and “method” states. Make SILDefaultWitnessTable::Entry an alias for SILWitnessTable::Entry, and unify all of the parsing/printing/ (de)serialization logic.