GISel: Canonicalize select tests using update_mir_test_checks

This runs `udpate_mir_test_checks --add-vreg-checks` on the tests taht
are already more or less in the format that generates, so that there
will be less churn in some upcoming changes.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@316139 91177308-0d34-0410-b5e6-96231b3b80d8