gccgo does not distinguish "use" and "assign" in these error

messages.  Match gccgo output.

named1.go:32:2: error: argument 0 has wrong type (cannot use type bool as type Bool)
named1.go:33:2: error: argument 0 has wrong type (cannot use type bool as type Bool)
named1.go:35:5: error: incompatible type for map index (cannot use type bool as type Bool)
named1.go:36:12: error: incompatible type for map assignment (cannot use type Bool as type bool)
named1.go:38:5: error: incompatible types in assignment (cannot use type bool as type Bool)
named1.go:40:2: error: argument 0 has wrong type (cannot use type bool as type Bool)
named1.go:42:5: error: incompatible type for receive (cannot use type bool as type Bool)
named1.go:46:5: error: incompatible type for type guard (cannot use type bool as type Bool)
named1.go:50:5: error: incompatible type for type guard (cannot use type bool as type Bool)
named1.go:53:2: error: argument 0 has wrong type (cannot use type bool as type Bool)
named1.go:54:5: error: incompatible types in assignment (cannot use type bool as type Bool)

R=rsc
DELTA=4  (0 added, 0 deleted, 4 changed)
OCL=35943
CL=35943

test/named1.go

@@ -32,22 +32,22 @@ func main() {
 	asBool(1!=2);	// ERROR "cannot use.*type bool.*as type Bool"
 	asBool(i < j);	// ERROR "cannot use.*type bool.*as type Bool"
 
-	_, b = m[2];	// ERROR "cannot assign bool.*type Bool"
+	_, b = m[2];	// ERROR "cannot .* bool.*type Bool"
 	m[2] = 1, b;	// ERROR "cannot use.*type Bool.*as type bool"
 
 	b = c<-1;	// ERROR "cannot use.*type bool.*type Bool"
 	_ = b;
 	asBool(c<-1);	// ERROR "cannot use.*type bool.*as type Bool"
 
-	_, b = <-c;	// ERROR "cannot assign bool.*type Bool"
+	_, b = <-c;	// ERROR "cannot .* bool.*type Bool"
 	_ = b;
 
 	var inter interface{};
-	_, b = inter.(Map);	// ERROR "cannot assign bool.*type Bool"
+	_, b = inter.(Map);	// ERROR "cannot .* bool.*type Bool"
 	_ = b;
 
 	var minter interface{M()};
-	_, b = minter.(Map);	// ERROR "cannot assign bool.*type Bool"
+	_, b = minter.(Map);	// ERROR "cannot .* bool.*type Bool"
 	_ = b;
 
 	asBool(closed(c));	// ERROR "cannot use.*type bool.*as type Bool"