[DWARFYAML] Implement the .debug_rnglists section.

This patch implements the .debug_rnglists section. We are able to
produce the .debug_rnglists section by the following syntax.

```
debug_rnglists:
  - Format:              DWARF32 ## Optional
    Length:              0x1234  ## Optional
    Version:             5       ## Optional
    AddressSize:         0x08    ## Optional
    SegmentSelectorSize: 0x00    ## Optional
    OffsetEntryCount:    2       ## Optional
    Offsets:             [1, 2]  ## Optional
    Lists:
      - Entries:
          - Operator: DW_RLE_base_address
            Values:   [ 0x1234 ]
```

The generated .debug_rnglists is verified by llvm-dwarfdump, except for
the operator DW_RLE_startx_endx, since llvm-dwarfdump doesn't support
it.

Reviewed By: jhenderson

Differential Revision: https://reviews.llvm.org/D83624