FreeBSD/src 3fd19ce (r355789)sys/kern kern_mutex.c

mtx: eliminate recursion support from thread lock

Now that it is not used after schedlock changes got merged.

Note the unlock routine temporarily still checks for it on account of just using
regular spin unlock.

This is a prelude towards a general clean up.
DeltaFile
+10-22sys/kern/kern_mutex.c
+10-221 files

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