Automated g4 rollback of changelist 25024,

plus significant hand editing.

Back to T{x} for composite literals.

R=r
OCL=25612
CL=25632

src/lib/os/error.go

@@ -33,7 +33,7 @@ func NewError(s string) *Error {
 	if ok {
 		return err
 	}
-	err = &Error(s);
+	err = &Error{s};
 	errorStringTab[s] = err;
 	return err;
 }