of protocol types to correctly handle self-assignment.
This ends up creating such a large amount of code that it's
worth extracting into its own helper function. Fortunately,
this can be the same helper function for every protocol type.
Swift SVN r1905
pointer TypeInfo more conveniently. Have this class return true for
isSingleRetainablePointer(). Further specialize the implementations
of the value witnesses so that we no longer ever require type-specific
witnesses for reference types.
Swift SVN r1900
value witnesses goes.
There are three major remaining things to do to support protocols:
- laying out the actual protocol members
- emitting witnesse for the actual protocol members
- detecting uses of the actual protocol members and funnelling
them through the witnesses as appropriate
All this work was just to let us treat protocol types as
first-class values.
Swift SVN r1899
