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Initialize all the flags of new created types

This change simplify the logic in mktype()

--- a/cc1/types.c

+++ b/cc1/types.c

@@ -452,7 +452,9 @@

 	type.type = tp;

 	type.op = op;

+	type.defined = 0;

 	type.arith = 0;

+	type.sign = 0;

 	type.integer = 0;

 	type.printed = 0;

 	type.aggreg = 0;

@@ -465,7 +467,7 @@

 	switch (op) {

 	case ARY:

 		if (nelem == 0)

-			goto no_defined;

+			break;

 		/* PASSTROUGH */

 	case FTN:

 	case PTR:

@@ -475,14 +477,11 @@

 		type.printed = 1;

 		type.integer = 1;

 		type.arith = 1;

-		type.sign = 0;

 		type.n.rank = RANK_INT;

-		goto no_defined;

+		break;

 	case STRUCT:

 	case UNION:

 		type.aggreg = 1;

-	no_defined:

-		type.defined = 0;

 		break;

 	}