Doug Gregor 02d25888c9 Clean up the interface to Type::subst(), NFC. ...

Replace the 'ignoreMissing' boolean flag with a new option set type,
SubstOptions, which is easier to extend. It is not an OptionSet<>
because a follow-on commit will introduce a non-trivial option that
will require more storage.

Also eliminate the LazyResolver parameter, which is no longer
needed. Eliminate the silly TypeChecker::substType(), whose only
purpose was to provide the resolver.

Swift SVN r27656

2015-04-23 23:36:18 +00:00

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