Increase the maximum size of strstab

The strtab size was limited in the legacy version to 0x7fff.  This
was generally sufficient because of how the strtab was implemented.
Now that all strings used in a probe program are stored in a single
strtab (incl. probe description names), a higher limit is needed.

All string offsets (and strtab size calculations) are using ssize_t,
so we use SSIZE_MAX as the upper limit.

Signed-off-by: Kris Van Hees <kris.van.hees@oracle.com>
Reviewed-by: Eugene Loh <eugene.loh@oracle.com>

include/dtrace/dif_defines.h

@@ -113,7 +113,7 @@
 #endif
 
 #define	DIF_INTOFF_MAX		0xffff	/* highest integer table offset */
-#define	DIF_STROFF_MAX		0x7fff	/* highest string table offset */
+#define	DIF_STROFF_MAX		SSIZE_MAX /* highest string table offset */
 #define	DIF_REGISTER_MAX	0xff	/* highest register number */
 #define	DIF_VARIABLE_MAX	0xffff	/* highest variable identifier */
 #define	DIF_SUBROUTINE_MAX	0xffff	/* highest subroutine code */