[llvm] [BOLT][DWARF] Add support for .debug_names (PR #81062)

[Alexander Yermolovich via llvm-commits]

ayermolo wrote:

Stats collected on internal binary with descent size .debug_names section (bolt generated)
[70] .debug_names      PROGBITS        0000000000000000 1b03a2b06 877d092 00      0   0  1

base:
9:12.18 real,   642.61 user,    186.98 sys,     0 amem, 78477316 mmem
.debug_names before string offset fix:
11:02.32 real,  742.95 user,    188.14 sys,     0 amem, 82591356 mmem
.debug_names after string offset refactor (no longer using DebugStrOffsetsWriter)
11:02.32 real,  742.95 user,    188.14 sys,     0 amem, 82591356 mmem

https://github.com/llvm/llvm-project/pull/81062