[ORC] Plumb error notifications through the VSO interface.
This allows materializers to notify the VSO that they were unable to
resolve or finalize symbols.
Should it be
assert((I == Symbols.end() || !I->second.Flags.isMaterializing()) &&
"Attempt to replace materializing symbol definition");
It should! Thanks for catching this. I've fixed it in r329934.
glad to help :)