Function validate

src/deinline.cpp:679–716

	sBB* exit;
	path_t() : exit(nullptr) {}
	bool validate(qstring* errorStr)
	{
		// check single node paths is large enought
		if (size() < 2 && front()->instCnt < MIN_LEN_OF_1_BLOCK_INLINE) {
			errorStr->sprnt("Single block inline applicant at %a has %d microcode instructions, should be at least %d",
				front()->bgn, front()->instCnt, MIN_LEN_OF_1_BLOCK_INLINE);
			return false;
		}

		// do not check single block path for entries/exits
		if(front()->kind == eBBK_single)
			return true;

		// check path has no other entries from outside except head
		if (size() > 1) {
			auto pi = begin(); pi++;
			for (; pi != end(); pi++) {
				for (auto p : (*pi)->preds) {
					if (!has_item(p)) {
						errorStr->sprnt("entrance into the middle (from block %a to block %a). Head block %a must be a single entry", p->bgn, (*pi)->bgn, front()->bgn);
						return false;
					}
				}
			}
		}
		// check path has no any other exit outside
		for (auto pi : *this) {
			if(pi->kind == eBBK_tail) // tail block should be cut off before branch
				continue;
			for (auto s : pi->succs) {
				if (!has_item(s) && s != exit) {
					errorStr->sprnt("more then one exit (from block %a to block %a). Exit block %a must be alone", pi->bgn, s->bgn, exit->bgn);
					return false;
				}
			}
		}
		return true;
	}
	bool create_from_head_exit(sBB* head, sBB* exit_, qstring* errorStr)
	{
		clear();