[llvm] [DebugInfo] Accept DW_OP_xderef_size and DW_OP_lit1..DW_OP_lit31. (PR #227839)

[Eric Christopher via llvm-commits]

https://github.com/echristo approved this pull request.

Couple of latent/unexciting things. Feel free to commit after deciding on them.

https://github.com/llvm/llvm-project/pull/227839