message: Add a hint to the "Unable to resolve runtime symbol" error message.
diff: @@ -153,7 +153,10 @@ llvm::JITSymbol SimpleOrcJIT::ResolveRuntimeSymbol(const std::string& name) {
  }
  if (func_addr == nullptr) {
  - LOG(ERROR) << "Unable to resolve runtime symbol: " << name;
  + LOG(ERROR)
  + << "Unable to resolve runtime symbol: `" << name
  + << "'. Hint: if the symbol a custom call target, make sure you've "
  + "registered it with the JIT using REGISTER_CUSTOM_CALL_TARGET.";
  return nullptr;
  }
  llvm::JITEvaluatedSymbol symbol_info(reinterpret_cast<uint64_t>(func_addr),
  