The issue here is that SILGen is expecting the argument pattern for the
synthesized ConstructorDecl to line up with the stored property list for the
decl containing the constructor. This is super fragile and probably the wrong
way to go (it would be better for sema to synthesize the entire ctor and make it
not be magical at all in silgen), but do a small fix to improve the situation
by inserting the lazy property storage next to the computed lazy property.
Swift SVN r19642
