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Use type size in increments of pointers in cc1

The code was using always a value of 1, even in the case of
pointers, where the correct value is the size of the pointer.

--- a/cc1/expr.c

+++ b/cc1/expr.c

@@ -340,6 +340,7 @@

 incdec(Node *np, char op)

 {

 	Type *tp = np->type;

+	Node *inc;

 	chklvalue(np, np->type);

@@ -347,11 +348,15 @@

 	case PTR:

 		if (!tp->defined)

 			error("invalid use of indefined type");

+		inc = sizeofcode(tp->type);

+		break;

 	case INT: case FLOAT:

-		return arithmetic(op, np, symcode(one));

+		inc = symcode(one);

+		break;

 	default:

 		error("incorrect type in arithmetic operation");

 	}

+	return arithmetic(op, np, inc);

 }

 static Node *

-- 

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