R600/SI: Create e64 versions of and/or/xor in SILowerI1Copies

This fixes moving boolean constants into registers before operating
on them. They get permuted and shrunk down to e32 anyway later. This
is a temporary fix until the patch that removes these pseudos is
committed.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@222844 91177308-0d34-0410-b5e6-96231b3b80d8