[GVN] Make a test case more robust

The singleton !range metadata gets simplified more aggressively after a
later change, so change the !range metadata to contain more than one
element.

While at it, turn some `; CHECK` s to `; CHECK-LABEL:` s.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@251485 91177308-0d34-0410-b5e6-96231b3b80d8
1 file changed