[ARM] Make ARMExpandPseudo add implicit uses for predicated instructions

Missing these could potentially screw up post-ra scheduling.

Issue found by inspection, so I don't have a real testcase. Included
test just verifies the expected operands after expansion.

Differential Revision: https://reviews.llvm.org/D35156



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@312589 91177308-0d34-0410-b5e6-96231b3b80d8
2 files changed