[m-rev.] trivial diff: update some documentation

[Julien Fischer]

Estimated hours taken: 0.1
Branches: main

Update some documentation.

runtime/mercury_conf_param.h:
 	Document that MR_PIC_REG is currently unused.

Julien

Index: mercury_conf_param.h
===================================================================
RCS file: /home/mercury/mercury1/repository/mercury/runtime/mercury_conf_param.h,v
retrieving revision 1.104
diff -u -r1.104 mercury_conf_param.h
--- mercury_conf_param.h	10 Dec 2007 14:55:28 -0000	1.104
+++ mercury_conf_param.h	13 Dec 2007 01:03:05 -0000
@@ -548,6 +548,9 @@
  #endif

  /*
+** NOTE: MR_PIC_REG is currently unused and does not have any affect. 
+** The following describes what it was previously used for:
+**
  ** Should we keep the GOT register (e.g. ebx on i386) free for PIC code?
  ** We need to do this if we are generating position independent code
  ** (MR_PIC), or if we are linking with position independent Mercury code

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