resolve: Do not error on access to proc macros imported with #[macro_use]

src/test/ui-fulldeps/proc-macro/macro-use-attr.rs

@@ -8,12 +8,12 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
+// compile-pass
 // aux-build:attr_proc_macro.rs
 
 #[macro_use] extern crate attr_proc_macro;
 
 #[attr_proc_macro]
-//~^ ERROR: attribute procedural macros cannot be imported with `#[macro_use]`
 struct Foo;
 
 fn main() {

src/test/ui-fulldeps/proc-macro/macro-use-bang.rs

@@ -8,6 +8,7 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
+// compile-pass
 // aux-build:bang_proc_macro.rs
 
 #![feature(proc_macro_non_items)]
@@ -17,5 +18,4 @@ extern crate bang_proc_macro;
 
 fn main() {
     bang_proc_macro!(println!("Hello, world!"));
-    //~^ ERROR: procedural macros cannot be imported with `#[macro_use]`
 }