[lldb] Skip scoped enum checks with Dwarf <4

The scoped enum tests depend on DW_AT_enum_class which was added in
Dwarf 4.

I made part of the test conditional on the Dwarf version instead of
splitting it into a separate test and using the decorator to avoid the
overhead of setting up the test.

GitOrigin-RevId: fbc13e9345c7c9607f0c28e0ccfa9a7baf254f29
1 file changed