Revert small change to EmitDeclRefLValue

That small change, although it looked harmless, it made emitting the LValue
on the PHI node without the proper cast. Reverting it fixes PR19841.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@209663 91177308-0d34-0410-b5e6-96231b3b80d8