Update x86 crate to version 0.8.0 (#266)

blog/post/10-better-exception-messages.md

@@ -629,11 +629,11 @@ Now we can improve our page fault error message by using the new `PageFaultError
 extern "C" fn page_fault_handler(stack_frame: &ExceptionStackFrame,
                                  error_code: u64) -> !
 {
-    use x86::controlregs;
+    use x86::shared::control_regs;
     println!(
         "\nEXCEPTION: PAGE FAULT while accessing {:#x}\
         \nerror code: {:?}\n{:#?}",
-        unsafe { controlregs::cr2() },
+        unsafe { control_regs::cr2() },
         PageFaultErrorCode::from_bits(error_code).unwrap(),
         unsafe { &*stack_frame });
     loop {}