ld64 emits them in address order but not in alphabetical order. This
sorting is particularly expensive for dead-stripped symbols (which don't
need to be sorted at all, unlike live symbols that need to be sorted by
address).
Timings for chromium_framework_less_dwarf (with the `-map` flag added to
the response file) on my 16-core Mac Pro:
base diff difference (95% CI)
sys_time 1.997 ± 0.038 2.004 ± 0.028 [ -0.6% .. +1.3%]
user_time 8.698 ± 0.085 8.167 ± 0.070 [ -6.6% .. -5.6%]
wall_time 7.965 ± 0.114 7.715 ± 0.347 [ -5.1% .. -1.2%]
samples 25 23
Reviewed By: #lld-macho, thakis
Differential Revision: https://reviews.llvm.org/D136536
39917b5e01