lldb: Add support for printing variables with DW_AT_ranges on DW_TAG_subprograms

Finishing out the support (to the best of my knowledge/based on current
testing running the whole check-lldb with a clang forcibly using
DW_AT_ranges on all DW_TAG_subprograms) for this feature.

Differential Revision: https://reviews.llvm.org/D94064