Provide the BTREE_SEEK_EQ hint to the b-tree layer.

FossilOrigin-Name: e750830f1e61160c0c67e35b13e50b35a95b50e1
diff --git a/src/sqliteInt.h b/src/sqliteInt.h
index 7a4afd2..9e174d6 100644
--- a/src/sqliteInt.h
+++ b/src/sqliteInt.h
@@ -2692,7 +2692,8 @@
 #define OPFLAG_LENGTHARG     0x40    /* OP_Column only used for length() */
 #define OPFLAG_TYPEOFARG     0x80    /* OP_Column only used for typeof() */
 #define OPFLAG_BULKCSR       0x01    /* OP_Open** used to open bulk cursor */
-#define OPFLAG_P2ISREG       0x02    /* P2 to OP_Open** is a register number */
+#define OPFLAG_SEEKEQ        0x02    /* OP_Open** cursor uses EQ seek only */
+#define OPFLAG_P2ISREG       0x04    /* P2 to OP_Open** is a register number */
 #define OPFLAG_PERMUTE       0x01    /* OP_Compare: use the permutation */
 
 /*