[Bug gcov-profile/68025] pragma/attribute optimize("profile-arcs") does not work as intended

[coolypf at qq dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=68025

--- Comment #5 from Yuan Pengfei <coolypf at qq dot com> ---
(In reply to Martin Liška from comment #4)
> May I please ask you for motivation of having such a control?

Some functions in the Linux kernel, when instrumented, may cause boot failure.

Therefore, fine-grained instrumentation control is needed.