RFC: fix hardwired constants

[Gary Benson <gbenson@redhat.com>]

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Hi all,

This is a cleanup I made while poking around in the blockvector code.
I think it's obvious but I wanted to check; I've not invoked the
obvious rule before.

Thanks,
Gary

-- 
http://gbenson.net/

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2012-01-19  Gary Benson  <gbenson@redhat.com>

	* mdebugread.c (sort_blocks): Replace integer constants with ones
	derived from FIRST_LOCAL_BLOCK.

diff --git a/gdb/mdebugread.c b/gdb/mdebugread.c
index c95c09b..e6d3b8c 100644
--- a/gdb/mdebugread.c
+++ b/gdb/mdebugread.c
@@ -4713,7 +4713,7 @@ sort_blocks (struct symtab *s)
 {
   struct blockvector *bv = BLOCKVECTOR (s);
 
-  if (BLOCKVECTOR_NBLOCKS (bv) <= 2)
+  if (BLOCKVECTOR_NBLOCKS (bv) <= FIRST_LOCAL_BLOCK)
     {
       /* Cosmetic */
       if (BLOCK_END (BLOCKVECTOR_BLOCK (bv, GLOBAL_BLOCK)) == 0)
@@ -4728,7 +4728,7 @@ sort_blocks (struct symtab *s)
    * are very different.  It would be nice to find a reliable test
    * to detect -O3 images in advance.
    */
-  if (BLOCKVECTOR_NBLOCKS (bv) > 3)
+  if (BLOCKVECTOR_NBLOCKS (bv) > FIRST_LOCAL_BLOCK + 1)
     qsort (&BLOCKVECTOR_BLOCK (bv, FIRST_LOCAL_BLOCK),
 	   BLOCKVECTOR_NBLOCKS (bv) - FIRST_LOCAL_BLOCK,
 	   sizeof (struct block *),