message: Tweak dev RE to allow _ in names
diff: @@ -125,7 +125,7 @@ std::pair<FlatTensorAccess, StripeLocation> ComputeAccessAndLoc(Value* tensor) {
  if (dim.cls == kAddressClassIdentifier) {
  access.emplace_back(ret.access[i]);
  } else {
  - static llvm::Regex re{R"(([[:alpha:]]+)_([[:digit:]]+)_([[:digit:]]+))"};
  + static llvm::Regex re{R"(([[:alpha:]_]+)_([[:digit:]]+)_([[:digit:]]+))"};
  if (re.match(dim.cls, &matches)) {
  const auto& dev_name = matches[1];
  size_t dev_idx, unit_idx;
  