[sql] Import reference version of SQLite 3.7.6.3.

third_party/sqlite/sqlite-src-3070603/src/vdbeaux.c

 /*
 ** 2003 September 6
 **
 ** The author disclaims copyright to this source code.  In place of
 ** a legal notice, here is a blessing:
 **
 **    May you do good and not evil.
 **    May you find forgiveness for yourself and forgive others.
 **    May you share freely, never taking more than you give.
 **
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 ** in a better query plan.
 */
 void sqlite3VdbeSetVarmask(Vdbe *v, int iVar){
   assert( iVar>0 );
   if( iVar>32 ){
     v->expmask = 0xffffffff;
   }else{
     v->expmask |= ((u32)1 << (iVar-1));
   }
 }