As of now, timeline can be better converted to systrace of Android platform(see flutter/flutter#47771). This PR is in order to support the trace function converted to the instruments of iOS platform.

something needs to be explained:

I redefine the macro OS_LOG_CALL_WITH_FORMAT_NAME to remove the constraint that the name must be argument must be a string constant in OS_LOG_STRING, otherwise it will run out of error as below:

error: static_assert failed due to requirement '__builtin_constant_p(str1)' "format/label/description argument must be a string constant"

run application with --systrace, we can see that the timeline events are all converted to the instruments IDE: