message: [XLA:CPU:Mac] Add __bzero intrinsic on Mac.
  Make the log message on missing intrinsic louder (ideally, we wouldn't crash, too.)
diff: @@ -139,7 +139,7 @@ llvm::JITSymbol SimpleOrcJIT::ResolveRuntimeSymbol(const std::string& name) {
  }
  if (func_addr == nullptr) {
  - VLOG(2) << "Unable to resolve runtime symbol: " << name;
  + LOG(ERROR) << "Unable to resolve runtime symbol: " << name;
  return nullptr;
  }
  llvm::JITEvaluatedSymbol symbol_info(reinterpret_cast<uint64_t>(func_addr),
  @@ -316,6 +316,7 @@ bool RegisterKnownJITSymbols() {
  registry->Register("memset", reinterpret_cast<void*>(memset));
  #ifdef __APPLE__
  + registry->Register("__bzero", reinterpret_cast<void*>(bzero));
  registry->Register("memset_pattern16",
  reinterpret_cast<void*>(memset_pattern16));
  #endif
  