trivial diff: Update macro names in README

[Mark Anthony BROWN]

Estimated hours taken: 0.1

trace/README:
	Update some macro names.


Index: trace/README
===================================================================
RCS file: /home/mercury1/repository/mercury/trace/README,v
retrieving revision 1.2
diff -u -t -r1.2 README
--- README	1998/11/14 03:39:44	1.2
+++ README	1999/03/22 05:47:29
@@ -29,7 +29,7 @@
 make_aligned_string(), etc. that modify the heap pointer must call
 restore_transient_regs() beforehand and must call save_transient_regs()
 afterwards.  The simplest way to do this is to use the macro
-MR_USE_HP() in trace/mercury_trace_util.h.
+MR_TRACE_USE_HP() in trace/mercury_trace_util.h.
 
 The tracer may invoke Mercury code defined in the browser or library
 directories if that code is exported to C using `pragma export'.
@@ -38,4 +38,4 @@
 prefixes, must be preceded by a call to save_registers() and
 followed by a call to restore_registers().
 The simplest way to do this is to use the macro
-MR_CALL_MERCURY() in trace/mercury_trace_util.h.
+MR_TRACE_CALL_MERCURY() in trace/mercury_trace_util.h.


-- 
Mark Brown  (dougl at cs.mu.oz.au)       )O+   |  For Microsoft to win,
MEngSc student,                             |  the customer must lose
Dept of Computer Science, Melbourne Uni     |          -- Eric S. Raymond