swift234

Change 'self' to be an rvalue instead of an lvalue in non-@mutating
struct methods.  This does not including properties and subscripts,
but covers the bulk of the change.  The implication of this is that
the compiler now rejects mutations of self in a non-@mutating method,
and rejects attempts to call a @mutating method from a non-@mutating
method.

Along with this:
 - Fix a refcounting bug in SILGenExpr where I emitted multiple releases
   in the rvalue member_ref_expr case, which was exposed by the 
   testsuite now that rvalues are being used a lot more.
 - Change a few native binding things in objc/Foundation to understand
   that String is passed by value now when calling size() and that
   you can't take the address of self in a non-mutating method (this
   should probably pass the components by value instead of passing
   &self, for better performance).  I filed rdar://15726720 to track
   this.
 - Update a ton of testcases.  We now don't materialize nearly as much
   as we used to.
 - Brutalize the test/stdlib/Getopt.swift testcase to work, now that
   the "GetoptLongOptions().noArgument("foo")" builder pattern doesn't
   work anymore (noArgument is a @mutating method, which isn't allowed
   on an rvalue temporary).



Swift SVN r11662