Add the "PRAGMA vdbe_eqp" command, only available with SQLITE_DEBUG.  Simplify
some of the other debugging logic.

FossilOrigin-Name: 8ce33f4c818e1c785a1c176f6f631b8184e1166b
diff --git a/src/sqliteInt.h b/src/sqliteInt.h
index 0ae55ed..8838f7a 100644
--- a/src/sqliteInt.h
+++ b/src/sqliteInt.h
@@ -1043,6 +1043,7 @@
 #define SQLITE_EnableTrigger  0x00800000  /* True to enable triggers */
 #define SQLITE_DeferFKs       0x01000000  /* Defer all FK constraints */
 #define SQLITE_QueryOnly      0x02000000  /* Disable database changes */
+#define SQLITE_VdbeEQP        0x04000000  /* Debug EXPLAIN QUERY PLAN */
 
 
 /*