Reduce size of an IRStmt from 40 bytes to 32 bytes on LP64
by allocating the details of a PutI statement into a struct
of its own and link to that (as is being done for Dirty and CAS).

These are the VEX bits.


git-svn-id: svn://svn.valgrind.org/vex/trunk@2361 8f6e269a-dfd6-0310-a8e1-e2731360e62c
diff --git a/priv/main_main.c b/priv/main_main.c
index a627d67..a65867d 100644
--- a/priv/main_main.c
+++ b/priv/main_main.c
@@ -163,7 +163,7 @@
               || sizeof(IRStmt) == 24 /* arm */);
    } else {
       vassert(sizeof(IRExpr) == 48);
-      vassert(sizeof(IRStmt) == 40);
+      vassert(sizeof(IRStmt) == 32);
    }
 
    /* Really start up .. */