Look for executed OP_CALL.

Each function contains a list of all instructions inside, thus we should consider only OP_CALL that has already been executed. As the list is browsed from bottom to top, no more checks are necessary. The first match is what we
are looking for.

engine/vm.c

@@ -1775,7 +1775,7 @@ PH7_PRIVATE sxi32 VmExtractDebugTrace(ph7_vm *pVm, SySet *pDebugTrace, sxbool bA
 			aTrace.pArg = &pVm->pFrame->sArg;
 			for(sxi32 i = (SySetUsed(aByteCode) - 1); i >= 0 ; i--) {
 				VmInstr *cInstr = (VmInstr *)SySetAt(aByteCode, i);
-				if(cInstr->iP2) {
+				if(cInstr->iOp == PH7_OP_CALL && cInstr->bExec == TRUE) {
 					/* Extract file name & line */
 					aTrace.pFile = cInstr->pFile;
 					aTrace.nLine = cInstr->iLine;