[BOLT][DWARF] Change rangelists to use DW_RLE_offset_pair
Before we always used DW_RLE_startx_length. This is not very efficient and leads
to bigger .debug_addr section. Changed it to use
DW_RLE_base_addressx/DW_RLE_offset_pair.
clang-16 build in debug mode
llvm-bolt ran on it with --update-debug-sections
| section | before | after | diff | % decrease |
| .debug_rnglists |
32732292 |
31986051 | -746241 | 2.3% |
| .debug_addr |
14415808 |
14184128 | -231680 | 1.6% |
Reviewed By: maksfb
Differential Revision: https://reviews.llvm.org/D140439