[COMMITTED] Add NEWS entry mentioning addition of systemtap libm probes

[Siddhesh Poyarekar]

Hi,

I noticed Alex's entry in the NEWS for malloc probes and realized that
the libm probes addition ought to be mentioned too.  I've pushed the
following text.

Siddhesh

commit 80b3dadbe52a6078fcedd08068ee92a0aeaad8f9
Author: Siddhesh Poyarekar <siddhesh@redhat.com>
Date:   Thu Jan 16 10:19:18 2014 +0530

    Mention addition of multiple precision fallback libm probes in NEWS

diff --git a/NEWS b/NEWS
index 248f2c3..a1f7656 100644
--- a/NEWS
+++ b/NEWS
@@ -101,6 +101,9 @@ Version 2.19
 
 * SystemTap probes for malloc have been introduced.
 
+* SystemTap probes for slow multiple precision fallback paths of
+  transcendental functions have been introduced.
+
 * Support for powerpc64le has been added.
 
 * The soft-float powerpc port now supports e500 processors.