swift234

SILGen: Treat global vars as accessor functions.
Instead of considering `constant_ref @var` to give the address of `var` directly, consider it to be a `() -> [byref] T` function that returns the address, presumably after running the initializer for the global if necessary. Generate a DeclRef to a global var as a constant_ref to get the function followed by an apply to get the address. Actually generating the global accessor is still to be implemented.

Swift SVN r3389