[run-clang-tidy] Run clang-tidy in parallel

tools/run-clang-tidy

@@ -39,4 +39,8 @@ if [[ -z "${RUN_CLANG_TIDY}" ]]; then
 	exit 1
 fi
 
-${RUN_CLANG_TIDY} -p "${ROOTDIR}/compile_commands_wo_subprojects/"
+JOBS=$(nproc)
+
+${RUN_CLANG_TIDY} \
+	-p "${ROOTDIR}/compile_commands_wo_subprojects/" \
+	-j "${JOBS}"