Refs #11187. Set RelWithDebInfo instead of -g.

Code/Mantid/Build/CMake/GNUSetup.cmake

@@ -40,7 +40,7 @@ set( CMAKE_CXX_FLAGS_DEBUG "${CMAKE_CXX_FLAGS_DEBUG} -fno-omit-frame-pointer" )
 option(WITH_ASAN "Enable address sanitizer" OFF)
 if(WITH_ASAN)
   message(STATUS "enabling address sanitizer")
-  add_compile_options(-fno-omit-frame-pointer -fno-common -g -fsanitize=address)
+  add_compile_options(-fno-omit-frame-pointer -fno-common -fsanitize=address)
   set(CMAKE_MODULE_LINKER_FLAGS "${CMAKE_MODULE_LINKER_FLAGS} -fsanitize=address -lasan" )
   set(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} -fsanitize=address -lasan" )
   set(CMAKE_SHARED_LINKER_FLAGS "${CMAKE_SHARED_LINKER_FLAGS} -fsanitize=address -lasan" )