[sql] Import SQLite 3.17.0.

third_party/sqlite/src/ext/fts5/fts5_varint.c

 /*
 ** 2015 May 30
 **
 ** 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.
 **
@@ skipping 315 matching lines @@
   if( v<=0x3fff ){
     p[0] = ((v>>7)&0x7f)|0x80;
     p[1] = v&0x7f;
     return 2;
   }
   return fts5PutVarint64(p,v);
 }
 
 
 int sqlite3Fts5GetVarintLen(u32 iVal){
+#if 0
   if( iVal<(1 << 7 ) ) return 1;
+#endif
+  assert( iVal>=(1 << 7) );
   if( iVal<(1 << 14) ) return 2;
   if( iVal<(1 << 21) ) return 3;
   if( iVal<(1 << 28) ) return 4;
   return 5;
 }