[not part of build] reduced # of frames to 1, now using a global call_tree to store all stack crawls.

gc/boehm/gc_priv.h

@@ -225,9 +225,9 @@ typedef char * ptr_t;	/* A generic pointer to which we can add	*/
  * Number of frames and arguments to save in objects allocated by
  * debugging allocator.
  */
-#   define NFRAMES 30	/* Number of frames to save. Even for		*/
-			/* alignment reasons.				*/
-#   define NARGS 0	/* Mumber of arguments to save for each call.	*/
+#   define NFRAMES 1    /* Number of frames to save. Even for		*/
+                        /* alignment reasons.				*/
+#   define NARGS 0      /* Mumber of arguments to save for each call.	*/
 
 #   define NEED_CALLINFO