This patch further reduces the memory used by TT/TC (by about 15Mb

on 32 bits memcheck default nr of sectors).

Memory is reduced by using UShort typedef-s for Sector no and TTE no.
Note that for TTE no, we had a mixture of UShort, UInt and Int used
depending on the place (a TTE no was in any case constrained to be an UShort).

The bss memory/startup space is also reduced by allocating the htt on demand
(like tt and tc), using mmap the first time a sector is initialised.

Changes:
* pub_core_transtab.h :
   * 2 typedef to identify a sector and a tt entry (these 2 types are UShort)
   * add 2 #define 'invalid values' for these types
   * change the interface to use these types rather than UInt
* m_transtab.c
   * use wherever relevant these 2 new types rather than UInt or UShort
   * replace the use of -1 by INV_SNO or INV_TTE
   * remove now useless typecast from Int/UInt to UShort for tte
* schedule.c: use the new types






git-svn-id: svn://svn.valgrind.org/valgrind/trunk@15036 a5019735-40e9-0310-863c-91ae7b9d1cf9

Author: philippe

coregrind/m_scheduler/scheduler.c

@@ -1048,8 +1048,8 @@ void handle_chain_me ( ThreadId tid, void* place_to_chain, Bool toFastEP )
 {
    Bool found          = False;
    Addr ip             = VG_(get_IP)(tid);
-   UInt to_sNo         = (UInt)-1;
-   UInt to_tteNo       = (UInt)-1;
+   SECno to_sNo         = INV_SNO;
+   TTEno to_tteNo       = INV_TTE;
 
    found = VG_(search_transtab)( NULL, &to_sNo, &to_tteNo,
                                  ip, False/*dont_upd_fast_cache*/ );
@@ -1070,8 +1070,8 @@ void handle_chain_me ( ThreadId tid, void* place_to_chain, Bool toFastEP )
       }
    }
    vg_assert(found);
-   vg_assert(to_sNo != -1);
-   vg_assert(to_tteNo != -1);
+   vg_assert(to_sNo != INV_SNO);
+   vg_assert(to_tteNo != INV_TTE);
 
    /* So, finally we know where to patch through to.  Do the patching
       and update the various admin tables that allow it to be undone