*: introduce and use FAST_FUNC: regparm on i386, otherwise no-on

   text    data     bss     dec     hex filename
 808035     611    6868  815514   c719a busybox_old
 804472     611    6868  811951   c63af busybox_unstripped

diff --git a/coreutils/chmod.c b/coreutils/chmod.c
index 1bd0bd5..994308c 100644
--- a/coreutils/chmod.c
+++ b/coreutils/chmod.c
@@ -34,7 +34,7 @@
  * symbolic links encountered during recursive directory traversals.
  */
 
-static int fileAction(const char *fileName, struct stat *statbuf, void* param, int depth)
+static int FAST_FUNC fileAction(const char *fileName, struct stat *statbuf, void* param, int depth)
 {
 	mode_t newmode;