Allocate Parse objects off of the stack where appropriate for a substantial

performance increase and a size reduction.

FossilOrigin-Name: ea8affa9e453b201b479162f621b591e7a65a489

src/btree.c

@@ -763,7 +763,7 @@ static int btreeMoveto(
 ){
   int rc;                    /* Status code */
   UnpackedRecord *pIdxKey;   /* Unpacked index key */
-  char aSpace[200];          /* Temp space for pIdxKey - to avoid a malloc */
+  char aSpace[384];          /* Temp space for pIdxKey - to avoid a malloc */
   char *pFree = 0;
 
   if( pKey ){