Add a NEWS item about Vex type/function name changes.



git-svn-id: svn://svn.valgrind.org/valgrind/trunk@6419 a5019735-40e9-0310-863c-91ae7b9d1cf9
diff --git a/NEWS b/NEWS
index 5779459..397f474 100644
--- a/NEWS
+++ b/NEWS
@@ -20,6 +20,15 @@
   they just return 3 (as before).  Also, SET_VBITS doesn't report
   definedness errors if any of the V bits are undefined.
 
+Developer-visible changes:
+
+- The names of some functions and types within the Vex IR have changed.
+  So any existing tools will have to be updated to reflect these
+  changes.  The new names should be clearer.  The file
+  VEX/pub/libvex_ir.h is also much better commented, and serves as the
+  best documentation about Vex.
+
+
 Release 3.2.1 (16 Sept 2006)
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 3.2.1 adds x86/amd64 support for all SSE3 instructions except monitor