NVPTX does not support generating binary files, which is required for
these tests.
The majority of tests in 'DebugInfo/Generic' also require emitting
object files, so they all are disabled for NVPTX.
Differential Revision: https://reviews.llvm.org/D121996
These test cases all rely on a default target being specified. Adding
the requirement gets the tests properly skipped when
LLVM_DEFAULT_TARGET_TRIPLE is unset.