Fix bugs

Author: cezarbbb

tests/assembly-llvm/stack-protector/stack-protector-safe-stack.rs

@@ -1,7 +1,7 @@
+//@ add-core-stubs
 //@ revisions: all strong none safestack safestack_strong safestack_all
 //@ assembly-output: emit-asm
 //@ only-x86_64-unknown-linux-gnu
-//@ add-core-stubs
 //@ [all] compile-flags: -Z stack-protector=all
 //@ [strong] compile-flags: -Z stack-protector=strong
 //@ [none] compile-flags: -Z stack-protector=none
@@ -18,6 +18,7 @@
 #![no_std]
 
 extern crate minicore;
+use minicore::*;
 
 extern "C" {
     fn test4spss(p: *mut u8);