Enable use of DTRACE_PROBE* macros in "spl" module

This change modifies some of the infrastructure for enabling the use of
the DTRACE_PROBE* macros, such that we can use tehm in the "spl" module.

Currently, when the DTRACE_PROBE* macros are used, they get expanded to
create new functions, and these dynamically generated functions become
part of the "zfs" module.

Since the "spl" module does not depend on the "zfs" module, the use of
DTRACE_PROBE* in the "spl" module would result in undefined symbols
being used in the "spl" module. Specifically, DTRACE_PROBE* would turn
into a function call, and the function being called would be a symbol
only contained in the "zfs" module; which results in a linker and/or
runtime error.

Thus, this change adds the necessary logic to the "spl" module, to
mirror the tracing functionality available to the "zfs" module. After
this change, we'll have a "trace_zfs.h" header file which defines the
probes available only to the "zfs" module, and a "trace_spl.h" header
file which defines the probes available only to the "spl" module.

Reviewed by: Brad Lewis <brad.lewis@delphix.com>
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Prakash Surya <prakash.surya@delphix.com>
Closes #9525

module/zfs/arc.c

@@ -297,7 +297,7 @@
 #include <sys/zthr.h>
 #include <zfs_fletcher.h>
 #include <sys/arc_impl.h>
-#include <sys/trace_defs.h>
+#include <sys/trace_zfs.h>
 #include <sys/aggsum.h>
 #include <sys/cityhash.h>
 

module/zfs/dbuf.c

@@ -44,7 +44,7 @@
 #include <sys/zfeature.h>
 #include <sys/blkptr.h>
 #include <sys/range_tree.h>
-#include <sys/trace_defs.h>
+#include <sys/trace_zfs.h>
 #include <sys/callb.h>
 #include <sys/abd.h>
 #include <sys/vdev.h>

module/zfs/dmu.c

@@ -49,7 +49,7 @@
 #include <sys/sa.h>
 #include <sys/zfeature.h>
 #include <sys/abd.h>
-#include <sys/trace_defs.h>
+#include <sys/trace_zfs.h>
 #include <sys/zfs_rlock.h>
 #ifdef _KERNEL
 #include <sys/vmsystm.h>

module/zfs/dmu_tx.c

@@ -37,7 +37,7 @@
 #include <sys/sa.h>
 #include <sys/sa_impl.h>
 #include <sys/zfs_context.h>
-#include <sys/trace_defs.h>
+#include <sys/trace_zfs.h>
 
 typedef void (*dmu_tx_hold_func_t)(dmu_tx_t *tx, struct dnode *dn,
     uint64_t arg1, uint64_t arg2);

module/zfs/dnode.c

@@ -37,7 +37,7 @@
 #include <sys/zio.h>
 #include <sys/dmu_zfetch.h>
 #include <sys/range_tree.h>
-#include <sys/trace_defs.h>
+#include <sys/trace_zfs.h>
 #include <sys/zfs_project.h>
 
 dnode_stats_t dnode_stats = {

module/zfs/dsl_pool.c

@@ -48,7 +48,7 @@
 #include <sys/zfeature.h>
 #include <sys/zil_impl.h>
 #include <sys/dsl_userhold.h>
-#include <sys/trace_defs.h>
+#include <sys/trace_zfs.h>
 #include <sys/mmp.h>
 
 /*

module/zfs/multilist.c

@@ -18,7 +18,7 @@
 
 #include <sys/zfs_context.h>
 #include <sys/multilist.h>
-#include <sys/trace_defs.h>
+#include <sys/trace_zfs.h>
 
 /* needed for spa_get_random() */
 #include <sys/spa.h>

module/zfs/rrwlock.c

@@ -28,7 +28,7 @@
 
 #include <sys/refcount.h>
 #include <sys/rrwlock.h>
-#include <sys/trace_defs.h>
+#include <sys/trace_zfs.h>
 
 /*
  * This file contains the implementation of a re-entrant read

module/zfs/txg.c

@@ -33,7 +33,7 @@
 #include <sys/dsl_scan.h>
 #include <sys/zil.h>
 #include <sys/callb.h>
-#include <sys/trace_defs.h>
+#include <sys/trace_zfs.h>
 
 /*
  * ZFS Transaction Groups

module/zfs/vdev_removal.c

@@ -47,7 +47,7 @@
 #include <sys/abd.h>
 #include <sys/vdev_initialize.h>
 #include <sys/vdev_trim.h>
-#include <sys/trace_defs.h>
+#include <sys/trace_zfs.h>
 
 /*
  * This file contains the necessary logic to remove vdevs from a

module/zfs/zil.c

@@ -41,7 +41,7 @@
 #include <sys/dmu_tx.h>
 #include <sys/dsl_pool.h>
 #include <sys/metaslab.h>
-#include <sys/trace_defs.h>
+#include <sys/trace_zfs.h>
 #include <sys/abd.h>
 
 /*

module/zfs/zio.c

@@ -44,7 +44,7 @@
 #include <sys/dsl_scan.h>
 #include <sys/metaslab_impl.h>
 #include <sys/time.h>
-#include <sys/trace_defs.h>
+#include <sys/trace_zfs.h>
 #include <sys/abd.h>
 #include <sys/dsl_crypt.h>
 #include <sys/cityhash.h>

module/zfs/zrlock.c

@@ -39,7 +39,7 @@
  * function calls.
  */
 #include <sys/zrlock.h>
-#include <sys/trace_defs.h>
+#include <sys/trace_zfs.h>
 
 /*
  * A ZRL can be locked only while there are zero references, so ZRL_LOCKED is