[llvm] [llvm-dwarfdump] Make --verify for .debug_names multithreaded. (PR #127281)

[Alexander Yermolovich via llvm-commits]

ayermolo wrote:

> > Unfortunately adding lock_guard to DWARFVerifier::getNames kills all the performance. :( it invokes DIE.getShortName() which does recursive traversal of DIEs. This can include references to other CUs, thinlto case, or type units. Which triggers extracting all the DIEs for that TU/CU. Will need to think how to refactor this.
> 
> Didn't we have a "peek DIE name" function to address this issue?

I believe it's in only LLDB.
In it's implementation of DWARFUnit in Plugins/SymbolFile/DWARF

https://github.com/llvm/llvm-project/pull/127281