Avoid some unnecessary copying in Fformat etc.

This patch is just for performance; it should not affect behavior.
On my platform, it made the microbenchmark (format "%S" load-path)
run about 45% faster.  It should also speed up calls like (message
"%s" STRING).
* src/callint.c (Fcall_interactively):
* src/dbusbind.c (XD_OBJECT_TO_STRING):
* src/editfns.c (Fmessage, Fmessage_box):
* src/xdisp.c (vadd_to_log, Ftrace_to_stderr):
Use styled_format instead of Fformat or Fformat_message,
to avoid unnecessary copying.
* src/editfns.c (styled_format): New arg NEW_RESULT.
All uses changed.  Reuse an input string if it has the
right value and if !NEW_RESULT.
* src/lisp.h (style_format): New decl.

1 files changed, 2 insertions, 1 deletions

diff --git a/src/dbusbind.c b/src/dbusbind.c
index 4a7068416fe..789aa008611 100644
--- a/src/dbusbind.c
+++ b/src/dbusbind.c
@@ -237,7 +237,8 @@ static char *
 XD_OBJECT_TO_STRING (Lisp_Object object)
 {
   AUTO_STRING (format, "%s");
-  return SSDATA (CALLN (Fformat, format, object));
+  Lisp_Object args[] = { format, object };
+  return SSDATA (styled_format (ARRAYELTS (args), args, false, false));
 }
 
 #define XD_DBUS_VALIDATE_BUS_ADDRESS(bus)                               \