Add queue(2) debug macros as build options

Add QUEUE_MACRO_DEBUG_TRACE and QUEUE_MACRO_DEBUG_TRASH as proper kernel
options.  While here, alpha-sort the debug section of sys/conf/options.

Enable QUEUE_MACRO_DEBUG_TRASH in amd64 GENERIC (but not GENERIC-NODEBUG)
kernels.  It is similar in nature and cost to other use-after-free pointer
trashing we do in GENERIC.  It is probably reasonable to enable in any arch
GENERIC kernel that defines INVARIANTS.

sys/amd64/conf/GENERIC

@@ -96,6 +96,7 @@ options 	GDB			# Support remote GDB.
 options 	DEADLKRES		# Enable the deadlock resolver
 options 	INVARIANTS		# Enable calls of extra sanity checking
 options 	INVARIANT_SUPPORT	# Extra sanity checks of internal structures, required by INVARIANTS
+options 	QUEUE_MACRO_DEBUG_TRASH	# Trash queue(2) internal pointers on invalidation
 options 	WITNESS			# Enable checks to detect deadlocks and cycles
 options 	WITNESS_SKIPSPIN	# Don't run witness on spinlocks for speed
 options 	MALLOC_DEBUG_MAXZONES=8	# Separate malloc(9) zones

sys/amd64/conf/GENERIC-NODEBUG

@@ -40,3 +40,4 @@ nooptions       FULL_BUF_TRACKING
 nooptions	COVERAGE
 nooptions	KCOV
 nooptions	MALLOC_DEBUG_MAXZONES
+nooptions	QUEUE_MACRO_DEBUG_TRASH

sys/conf/NOTES

@@ -413,6 +413,18 @@ options 	DDB_NUMSYM
 #
 options 	GDB
 
+#
+# Trashes list pointers when they become invalid (i.e., the element is
+# removed from a list).  Relatively inexpensive to enable.
+#
+options 	QUEUE_MACRO_DEBUG_TRASH
+
+#
+# Stores information about the last caller to modify the list object
+# in the list object.  Requires additional memory overhead.
+#
+options 	QUEUE_MACRO_DEBUG_TRACE
+
 #
 # SYSCTL_DEBUG enables a 'sysctl' debug tree that can be used to dump the
 # contents of the registered sysctl nodes on the console.  It is disabled by

sys/conf/options

@@ -55,17 +55,19 @@ DDB_CAPTURE_DEFAULTBUFSIZE	opt_ddb.h
 DDB_CAPTURE_MAXBUFSIZE	opt_ddb.h
 DDB_CTF		opt_ddb.h
 DDB_NUMSYM	opt_ddb.h
+EARLY_PRINTF	opt_global.h
 FULL_BUF_TRACKING	opt_global.h
 GDB
 KDB		opt_global.h
 KDB_TRACE	opt_kdb.h
 KDB_UNATTENDED	opt_kdb.h
 KLD_DEBUG	opt_kld.h
+NUM_CORE_FILES	opt_global.h
+QUEUE_MACRO_DEBUG_TRACE	opt_global.h
+QUEUE_MACRO_DEBUG_TRASH	opt_global.h
 SYSCTL_DEBUG	opt_sysctl.h
-EARLY_PRINTF	opt_global.h
 TEXTDUMP_PREFERRED	opt_ddb.h
 TEXTDUMP_VERBOSE	opt_ddb.h
-NUM_CORE_FILES	opt_global.h
 TSLOG	opt_global.h
 TSLOGSIZE	opt_global.h