system_profiler: Add a mode for scheduling_recorder -r like profile -r.

And add the necessary logic in scheduling_recorder. This way we can
track scheduling profiling during the boot process.

Also

system_profiler: Add a mode for scheduling_recorder -r like profile -r.

And add the necessary logic in scheduling_recorder. This way we can
track scheduling profiling during the boot process.

Also remove B_SYSTEM_PROFILER_IO_SCHEDULING_EVENTS as it can't be
activated this early in the boot process.

Change-Id: If32f9b5d61c8cd2b3b36a4e6f8065301abd46149
Reviewed-on: https://review.haiku-os.org/c/haiku/+/7963
Reviewed-by: waddlesplash <waddlesplash@gmail.com>

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kernel: Rewrite B_DEBUG_SPINLOCK_CONTENTION.

* Replace count_low/count_high with bigtime_t fields plus an int32.
sizeof(spinlock) is now 32 bytes with the debug option enabled.

* Adjust and cl

kernel: Rewrite B_DEBUG_SPINLOCK_CONTENTION.

* Replace count_low/count_high with bigtime_t fields plus an int32.
sizeof(spinlock) is now 32 bytes with the debug option enabled.

* Adjust and clean up all spinlock code to use the new fields.

* Fold DEBUG_SPINLOCK_LATENCIES into the new code. Remove the bootloader
option and other flags for it (these were not compiled in by default.)

The new code should be much easier to understand and also more powerful.
However, the information transmitted to userland isn't as useful now;
the KDL command output will have the interesting information.

(Things could be reworked to transmit more interesting information to
userland again if desired, but as this code clearly hadn't been compiled
for many years, as it referred to global spinlocks that have been gone
for a very long time.)

Change-Id: I2cb34078bfdc7604f288a297b6cd1aa7ff9cc512
Reviewed-on: https://review.haiku-os.org/c/haiku/+/6943
Reviewed-by: waddlesplash <waddlesplash@gmail.com>
Tested-by: Commit checker robot <no-reply+buildbot@haiku-os.org>

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