struct annotations in imports.

distribute tag across multiple names.

R=ken
OCL=18178
CL=18178

src/cmd/gc/go.y

@@ -1892,10 +1892,11 @@ hidden_dcl:
 	}
 
 hidden_structdcl:
-	sym1 hidden_type
+	sym1 hidden_type oliteral
 	{
 		$$ = nod(ODCLFIELD, newname($1), N);
 		$$->type = $2;
+		$$->val = $3;
 	}
 |	'?' hidden_type
 	{

src/cmd/gc/subr.c

@@ -2192,8 +2192,10 @@ cleanidlist(Node *na)
 	if(last->type == T)
 		fatal("cleanidlist: no type");
 
-	for(n=na; n->op == OLIST; n=n->right)
+	for(n=na; n->op == OLIST; n=n->right) {
 		n->left->type = last->type;
+		n->left->val = last->val;
+	}
 	return na;
 }