swift234

teach SILGenFunction::emitIgnoredExpr to try a bit harder to avoid
emitting LoadExprs (unless they have a side effect that must be 
emitted).  This is good for -O0 code quality in general, but is important
to avoid materializing 'self' values in initializers that semantically
don't have to happen.

This is progress towards fixing: 
<rdar://problem/17207456> Unable to access dynamicType of an object in a class initializer that isn't done

enabling the struct cases.



Swift SVN r22735