[DWARFYAML] Add support for emitting custom range list content.
This patch adds support for emitting custom range list content.
We are able to handcraft a custom range list via the following syntax.
debug_rnglists: - Lists: - Entries: - Operator: DW_RLE_startx_endx Values: [ 0x1234, 0x1234 ] - Content: '1234567890abcdef' - Content: 'abcdef1234567890'
Reviewed By: jhenderson
Differential Revision: https://reviews.llvm.org/D84618