Get rid of the former rather baroque mechanism for propagating the values

of ThisStartUpID and RedoRecPtr into new backends.  It's a lot easier just
to make them all grab the values out of shared memory during startup.
This helps to decouple the postmaster from checkpoint execution, which I
need since I'm intending to let the bgwriter do it instead, and it also
fixes a bug in the Win32 port: ThisStartUpID wasn't getting propagated at
all AFAICS.  (Doesn't give me a lot of faith in the amount of testing that
port has gotten.)

src/backend/utils/init/postinit.c

@@ -8,7 +8,7 @@
  *
  *
  * IDENTIFICATION
- *	  $PostgreSQL: pgsql/src/backend/utils/init/postinit.c,v 1.131 2003/12/12 18:45:09 petere Exp $
+ *	  $PostgreSQL: pgsql/src/backend/utils/init/postinit.c,v 1.132 2004/05/27 17:12:54 tgl Exp $
  *
  *
  *-------------------------------------------------------------------------
@@ -325,6 +325,13 @@ InitPostgres(const char *dbname, const char *username)
 	 */
 	AmiTransactionOverride(bootstrap);
 
+	/*
+	 * Initialize local process's access to XLOG.  In bootstrap case
+	 * we may skip this since StartupXLOG() was run instead.
+	 */
+	if (!bootstrap)
+		InitXLOGAccess();
+
 	/*
 	 * Initialize the relation descriptor cache.  This must create at
 	 * least the minimum set of "nailed-in" cache entries.	No catalog