swift234

SILGen: Fix assign for nontrivial-type properties.
Properties don't need to do the load/retain/store/release dance of physical elements; the setter handles all of that. Rename emitStoreToLValue to emitAssignToLValue, and push the physical reassignment logic into emitAssignToLValue. Dump the old emitAssign since emitAssignToLValue now does everything it used to do. Add a FullExpr scope to the left-hand side of AssignStmts so their temporaries have better-fitting lifetimes.

Swift SVN r3461