[DEBUGINFO][NVPTX]Make tests more strict, NFC.

NVPTX format requires that no labels/label arithmetics is used in the
debug info sections. To avoid possible problems with the adding/modifying the debug info functionality, made these tests more strict.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@350731 91177308-0d34-0410-b5e6-96231b3b80d8
5 files changed