Revert "Tests: Be less dependent on a specific schedule/regalloc"

This reverts r192454

Apparently FileCheck isn't as smart as I though and does not enforce a
topological order between variable defs+uses.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@192472 91177308-0d34-0410-b5e6-96231b3b80d8