Add a Bloom filter to the automatic-index mechanism.

FossilOrigin-Name: 50ac4de1d7cbb586ea7969e1ae80ea8b021e194edc2fa7db19374b4ee9369bee

src/whereInt.h

@@ -64,6 +64,7 @@ struct WhereLevel {
   u32 iLikeRepCntr;     /* LIKE range processing counter register (times 2) */
   int addrLikeRep;      /* LIKE range processing address */
 #endif
+  int regFilter;        /* Bloom filter */
   u8 iFrom;             /* Which entry in the FROM clause */
   u8 op, p3, p5;        /* Opcode, P3 & P5 of the opcode that ends the loop */
   int p1, p2;           /* Operands of the opcode used to end the loop */