Stabilize const_refs_to_static

update tests

fix bitwidth-sensitive stderr output

use build-fail for asm tests

compiler/rustc_error_codes/src/error_codes/E0013.md

@@ -5,7 +5,7 @@ variable cannot refer to a static variable.
 
 Erroneous code example:
 
-```compile_fail,E0658
+```
 static X: i32 = 42;
 const Y: i32 = X;
 ```