swift234

Rework @inout handling in SILGen.  Now @inout is emitted as an rvalue,
not as part of the lvalue path.  This means that the arguments to a 
function (for example) are always rvalues - @inout arguments are not a
special case all over the place.

This removes emitLValueOrRValueAsRValue and emitLValueAsRValue, because
the lvalue that both of them were trying to handle was @inout, not @lvalue.



Swift SVN r11805