swift234

SIL: Make SILType independent of Type.
Move SILType to its own header, and make it its own container type consisting of a Type with an "isAddress" bit for representing address types. Move the "isAddressOnly" information from SILGen's TypeInfo onto SILType as a second bit, because address-only-ness is extremely useful for verification outside of SILGen. Instead of mangling function types during type lowering, rely on the fact that SILType is no longer a Type to force us to mangle argument and return types when we see them. (We may eventually need SILFunctionType and SILTupleType things to represent lowered SIL function and tuple types containing addresses, but for now we can lower function and tuple components as needed.)

Swift SVN r3551