message: Remove unnecessary break statements.
diff: @@ -349,10 +349,8 @@ llvm::CodeGenOpt::Level CodeGenOptLevel(const HloModuleConfig& module_config) {
  return llvm::CodeGenOpt::Less;
  case 2:
  return llvm::CodeGenOpt::Default;
  - break;
  case 3:
  return llvm::CodeGenOpt::Aggressive;
  - break;
  default:
  return llvm::CodeGenOpt::None;
  }
  