Complete rewrite (I think this is the 4th incarnation) of translation

table/cache management.  Two main changes.  (1) Translation areas are
recorded using VexGuestExtents, so that Vex is now properly supported
and code deletion works correctly.  (2) Low overhead BB profiling,
enabled by the --profile-flags=<XXXXXXXX> option.  This finds the top
N bbs at exit and shows them, so as to give a basis from which to do
performane tuning.

To support this, the way tt/tc work is changed.  It is still a
sectored arrangement, but now each sector has its own hash table.
This simplifies a lot of things.



git-svn-id: svn://svn.valgrind.org/valgrind/trunk@3226

include/basic_types.h

@@ -50,6 +50,7 @@ typedef unsigned long          UWord;     // 32             64
 typedef signed long            Word;      // 32             64
 
 typedef UWord                  Addr;      // 32             64
+typedef UWord                  AddrH;     // 32             64
 
 typedef UWord                  SizeT;     // 32             64
 typedef  Word                 SSizeT;     // 32             64