swift234

SILGen: Correctly determine whether property accessors are dynamically dispatched.

We were getting this wrong for properties introduced in class extensions, for which we currently do not emit vtable entries and so are statically dispatched. Fixes <rdar://problem/17577579>. This also incidentally fixes references to properties of generic classes, which should be dynamically dispatched, but weren't because of getDeclaredTypeOf/InContext confusion.

Swift SVN r19641