trivial diff: add MR_free_heap

[Simon Taylor]

Estimated hours taken: 0.1

runtime/mercury_heap.h
	Added a macro MR_free_heap() which calls GC_free() if CONSERVATIVE_GC
	is defined, and does nothing otherwise.


Index: mercury_heap.h
===================================================================
RCS file: /home/staff/zs/imp/mercury/runtime/mercury_heap.h,v
retrieving revision 1.7
diff -u -t -u -r1.7 mercury_heap.h
--- mercury_heap.h	1998/07/16 14:38:16	1.7
+++ mercury_heap.h	1998/08/02 08:28:51
@@ -88,6 +88,8 @@
                 (void)0                                                 \
         )
 
+  #define MR_free_heap(ptr)     GC_free((ptr))
+
 #else /* not CONSERVATIVE_GC */
 
   #define tag_incr_hp(dest, tag, count)                         \
@@ -125,6 +127,8 @@
   
   #define hp_alloc(count)        incr_hp(LVALUE_CAST(Word, MR_hp), count)
   #define hp_alloc_atomic(count) incr_hp_atomic(LVALUE_CAST(Word, MR_hp), count)
+
+  #define MR_free_heap(ptr)     ((void)0)
   
 #endif /* not CONSERVATIVE_GC */