kernel: Add new dwarf symbols

Add new symbols defined in dwarf 4 and dwarf 5.

Submitted by:		Matt Macy (in D17982, done differently)
Sponsored by:		Netflix
Reviewed by:		kib, markj, emaste
Differential Revision:	https://reviews.freebsd.org/D44072

sys/conf/debuginfo.ldscript

@@ -34,3 +34,8 @@
   /* DWARF 3 */
   .debug_pubtypes 0 : { *(.debug_pubtypes) }
   .debug_ranges   0 : { *(.debug_ranges) }
+  /* DWARF 4 */
+  .debug_types	0 : { *(.debug_types) }
+  /* DWARF 5 */
+  .debug_macro	0 : { *(.debug_macro) }
+  .debug_addr	0 : { *(.debug_addr) }