[DebugInfo] Fix test failed due to debug-label-mi.ll and debug-label-opt.ll

Make these two test cases more generic for other architectures.
Please refer to '[DebugInfo] Convert intrinsic llvm.dbg.label to
MachineInstr.'

Patch by Hsiangkai Wang

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@331853 91177308-0d34-0410-b5e6-96231b3b80d8
2 files changed