RFA: use memcpy, not a loop

[Tom Tromey <tromey@redhat.com>]

While debugging on the python branch I ran into a couple of loops that
can be replaced with memcpy.  I find that this is easier to read and
it makes debugging a bit friendlier.

Built and tested on the compile farm (x86-64).
Ok?

Tom

2008-07-28  Tom Tromey  <tromey@redhat.com>

	* cli/cli-decode.c (lookup_cmd_1): Use memcpy.
	(lookup_cmd_composition): Likewise.

diff --git a/gdb/cli/cli-decode.c b/gdb/cli/cli-decode.c
index 6908314..5b1a7e0 100644
--- a/gdb/cli/cli-decode.c
+++ b/gdb/cli/cli-decode.c
@@ -1112,11 +1112,7 @@ lookup_cmd_1 (char **text, struct cmd_list_element *clist,
 
 
   command = (char *) alloca (len + 1);
-  for (tmp = 0; tmp < len; tmp++)
-    {
-      char x = (*text)[tmp];
-      command[tmp] = x;
-    }
+  memcpy (command, *text, len);
   command[len] = '\0';
 
   /* Look it up.  */
@@ -1468,11 +1464,7 @@ lookup_cmd_composition (char *text,
        it's length is len).  We copy this into a local temporary */
       
       command = (char *) alloca (len + 1);
-      for (tmp = 0; tmp < len; tmp++)
-      {
-        char x = text[tmp];
-        command[tmp] = x;
-      }
+      memcpy (command, text, len);
       command[len] = '\0';
       
       /* Look it up.  */