Remove the long-orphaned DT_DISASM macro

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

libdtrace/dt_dis.h

@@ -1,6 +1,6 @@
 /*
  * Oracle Linux DTrace.
- * Copyright (c) 2021, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2021, 2022, Oracle and/or its affiliates. All rights reserved.
  * Licensed under the Universal Permissive License v 1.0 as shown at
  * http://oss.oracle.com/licenses/upl.
  */
@@ -15,8 +15,13 @@ extern "C" {
 #endif
 
 /*
- * The following disassembler listings can be requested.  The values can be
- * combined to select multiple listings.
+ * The following disassembler listings can be requested with -xdisasm=....
+ *    - After compilation and assembly of a clause function.
+ *    - After constructing a probe program.
+ *    - After linking in dependencies.
+ *    - After all processing, prior to loading the program.
+ * The values can be combined to select multiple listings.  The '-S' option
+ * must also be supplied in order for disassembler output to be generated.
  */
 #define DT_DISASM_OPT_CLAUSE		1	/* default */
 #define DT_DISASM_OPT_PROG		2
@@ -52,19 +57,6 @@ extern "C" {
 			dt_dis_difo((dp), (fp), (idp), (pdp), \
 				    "final program"); \
 	} while(0)
-/*
- * Macro to test whether a given disassembler bit is set in the dt_disasm
- * bit-vector.  If the bit for listing 'l' is set, the D disassembler will be
- * invoked for that specific listing.  The '-S' option must also be supplied in
- * order for disassembler output to be generated.
- *
- * Supported listings are:
- *	1	After compilation and assembly of a clause function.
- *	2	After constructing a probe program.
- *	3	After linking in dependencies.
- *	4	After all processing, prior to loading the program.
- */
-#define	DT_DISASM(dtp, l)		((dtp)->dt_disasm & (1 << ((l) - 1)))
 
 extern void dt_dis_program(dtrace_hdl_t *dtp, dtrace_prog_t *pgp, FILE *fp);
 extern void dt_dis_difo(const dtrace_difo_t *dp, FILE *fp,