[BOLT][DWARF] Change loclist encoding to use base_addrx

[BOLT][DWARF] Change loclist encoding to use base_addrx

Doing the same thing as for rangelists. Changing loclists to use base_addrx, it
slightly increases .debug_loclists, but reduces .debug_addr section.

| section             | clang-16.bolt.base | clang-16.bolt | raw       |  % |
| debug_loclists |  198208                  |  203398          | 5190     | 102%  |
| .debug_addr    | 14415808              | 14351448        | -64360 |99.5% |

Reviewed By: maksfb

Differential Revision: https://reviews.llvm.org/D141969