make test: Build tests in parallel

Change-Id: If7b9d0519554226d09d8e6264eb248cd2dd53a2e

hipamd/CMakeLists.txt

@@ -316,8 +316,9 @@ if(POLICY CMP0037)
 endif()
 add_custom_target(install_for_test COMMAND "${CMAKE_COMMAND}" --build . --target install
                                    WORKING_DIRECTORY ${CMAKE_BINARY_DIR})
+execute_process(COMMAND getconf _NPROCESSORS_ONLN OUTPUT_VARIABLE DASH_JAY OUTPUT_STRIP_TRAILING_WHITESPACE)
 add_custom_target(test COMMAND ${CMAKE_COMMAND} .
-                       COMMAND make
+                       COMMAND make -j ${DASH_JAY}
                        COMMAND make test
                        WORKING_DIRECTORY ${BUILD_DIR}
                        DEPENDS install_for_test)