[PATCH] [Core] Update references in parallel

[Davide Italiano]

REPOSITORY
  rL LLVM

================
Comment at: lib/Core/Resolver.cpp:355
@@ -353,3 +354,3 @@
           if (_symbolTable.isCoalescedAway(atom))
             _deadAtoms.insert(ref->target());
           continue;
----------------
ruiu wrote:
> I think this change is not thread-safe because of this line. _deadAtoms.insert is not thread-safe.
Oh this is really a bummer, considering it's such an hot codepath :(
Do you think it makes sense to surround insert with a lock and measure again and/or do you have a proposal for an alternative?

http://reviews.llvm.org/D8372

EMAIL PREFERENCES
  http://reviews.llvm.org/settings/panel/emailpreferences/