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[cc1] fix continue statement within do loop

--- a/cc1/stmt.c

+++ b/cc1/stmt.c

@@ -131,21 +131,26 @@

 static void

 Dowhile(Symbol *lbreak, Symbol *lcont, Switch *lswitch)

 {

-	Symbol *begin, *end;

+	Symbol *begin;

 	Node *np;

 	begin = newlabel();

-	end = newlabel();

+	lcont = newlabel();

+	lbreak = newlabel();

+

 	expect(DO);

+

 	emit(OBLOOP, NULL);

 	emit(OLABEL, begin);

-	stmt(end, begin, lswitch);

+	stmt(lbreak, lcont, lswitch);

 	expect(WHILE);

 	np = condition();

+	emit(OLABEL, lcont);

 	emit(OBRANCH, begin);

 	emit(OEXPR, np);

 	emit(OELOOP, NULL);

-	emit(OLABEL, end);

+

+	emit(OLABEL, lbreak);

 }

 static void