[m-rev.] trivial diff: add trail segments to NEWS file

[Julien Fischer]

Estimated hours taken: 0
Branches: main

NEWS:
 	Announce trail segment grades.

Julien.

Index: NEWS
===================================================================
RCS file: /home/mercury/mercury1/repository/mercury/NEWS,v
retrieving revision 1.496
diff -u -r1.496 NEWS
--- NEWS	12 Sep 2008 10:47:19 -0000	1.496
+++ NEWS	23 Sep 2008 06:37:16 -0000
@@ -227,6 +227,9 @@

  Changes to the Mercury compiler:

+* We have added support for trail segments, which allow programs to grow
+  the trail on demand.
+
  * Shared libraries are now used by default on Linux/x86 systems.

  * Support for the reserve tag grades has been removed.
@@ -415,6 +418,11 @@

  Changes to the Mercury compiler:

+* The option `--trail-segments', or grade component `.trseg', causes
+  programs to execute using trail segments, where segments can be allocated
+  at runtime, instead of using a fixed size trail.  This can prevent trail
+  exhaustion, but execution time will be increased.
+
  * There's a new back-end that targets Erlang.

    Compiler support for this new back-end is mostly complete,

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