Remove useless fields, free some memory.

engine/oop.c

@@ -68,8 +68,6 @@ PH7_PRIVATE ph7_class *PH7_NewRawClass(ph7_vm *pVm, const SyString *pName, sxu32
 	SyHashInit(&pClass->hAttr, &pVm->sAllocator, 0, 0);
 	SyHashInit(&pClass->hDerived, &pVm->sAllocator, 0, 0);
 	SySetInit(&pClass->aInterface, &pVm->sAllocator, sizeof(ph7_class *));
-	SySetInit(&pClass->sExtends, &pVm->sAllocator, sizeof(SyString));
-	SySetInit(&pClass->sImplements, &pVm->sAllocator, sizeof(SyString));
 	pClass->nLine = nLine;
 	/* All done */
 	return pClass;

include/ph7int.h

@@ -1046,8 +1046,6 @@ struct ph7_class {
 	SyHash hMethod;       /* Class methods */
 	sxu32 nLine;          /* Line number on which this class was declared */
 	SySet aInterface;     /* Implemented interface container */
-	SySet sExtends;       /* List of inherited classes / interfaces */
-	SySet sImplements;    /* List of implemented interfaces */
 };
 /* Class configuration flags */
 #define PH7_CLASS_FINAL       0x001 /* Class is final [cannot be extended] */