swift234

SIL: Parse and print SILFunction's context generic params.

- Alter parseSILType to take an optional GenericParamList out param to take the parsed GenericParamList, and use this to set the GenericParamList of parsed SILFunctions independent of their lowered type.
- Add a ContextGenericParams field to PrintOptions which, when set, provides a set of archetypes to print in place of the dependent types in an interface type.
- Use this to print the type of SILFunctions using their context generic params.

Swift SVN r13774