trim_trail for default machine

be more aggressive about try-retry-trust chains.
   - handle cases where block starts with a wait
   - don't use _killed instructions, just let the thing rot by itself.


git-svn-id: https://yap.svn.sf.net/svnroot/yap/trunk@1027 b08c6af1-5177-4d33-ba66-4b1c6b8b522a

H/rheap.h

@@ -8,11 +8,12 @@
 *									 *
 **************************************************************************
 *									 *
-* File:		rheap.c							 *
-* Last rev:								 *
-* mods:									 *
+* File:		rheap.h							 *
 * comments:	walk through heap code					 *
 *									 *
+* Last rev:     $Date: 2004-03-19 11:35:42 $,$Author: vsc $						 *
+* $Log: not supported by cvs2svn $									 *
+*									 *
 *************************************************************************/
 #ifdef SCCS
 static char     SccsId[] = "@(#)rheap.c	1.3 3/15/90";
@@ -559,9 +560,7 @@ restore_opcodes(yamop *pc)
     case _retry_and_mark:
     case _try_clause:
     case _retry:
-    case _retry_killed:
     case _trust:
-    case _trust_killed:
 #ifdef YAPOR
     case _getwork:
     case _getwork_seq: