[llvm] [BOLT][DWARF][NFC] Add parallelization for processing of DWO debug information (PR #100282)

[Alexander Yermolovich via llvm-commits]

ayermolo wrote:

I wonder if we can modify bolt/test/lit.local.cfg to add common llvm-bolt flags. So we don't have to copy past the same option everythere.
@aaupov WDYT?

https://github.com/llvm/llvm-project/pull/100282