Remove the EP_Vector expression flag.

FossilOrigin-Name: e9d9c6d46b46160fad6aa6e3441a65a09157515f
diff --git a/src/sqliteInt.h b/src/sqliteInt.h
index 9dfc0bc..5b38265 100644
--- a/src/sqliteInt.h
+++ b/src/sqliteInt.h
@@ -2327,7 +2327,6 @@
 #define EP_CanBeNull 0x100000 /* Can be null despite NOT NULL constraint */
 #define EP_Subquery  0x200000 /* Tree contains a TK_SELECT operator */
 #define EP_Alias     0x400000 /* Is an alias for a result set column */
-#define EP_Vector    0x800000 /* This expression is a row value */
 
 /*
 ** Combinations of two or more EP_* flags
@@ -4256,5 +4255,6 @@
 #endif
 
 int sqlite3ExprVectorSize(Expr *pExpr);
+int sqlite3ExprIsVector(Expr *pExpr);
 
 #endif /* SQLITEINT_H */