Cleanup liballoc use statements

Some modules were still using the deprecated `allocator` module, use the
`alloc` module instead.

Some modules were using `super` while it's not needed.

Some modules were more or less ordering them, and other not, so the
latter have been modified to match the others.

src/liballoc/boxed.rs

@@ -55,8 +55,6 @@
 
 #![stable(feature = "rust1", since = "1.0.0")]
 
-use raw_vec::RawVec;
-
 use core::any::Any;
 use core::borrow;
 use core::cmp::Ordering;
@@ -68,6 +66,8 @@ use core::mem::{self, Pin};
 use core::ops::{CoerceUnsized, Deref, DerefMut, Generator, GeneratorState};
 use core::ptr::{self, NonNull, Unique};
 use core::convert::From;
+
+use raw_vec::RawVec;
 use str::from_boxed_utf8_unchecked;
 
 /// A pointer type for heap allocation.

src/liballoc/raw_vec.rs

@@ -8,15 +8,16 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
-use alloc::{Alloc, Layout, Global};
 use core::cmp;
 use core::mem;
 use core::ops::Drop;
 use core::ptr::{self, NonNull, Unique};
 use core::slice;
-use super::boxed::Box;
-use super::allocator::CollectionAllocErr;
-use super::allocator::CollectionAllocErr::*;
+
+use alloc::{Alloc, Layout, Global};
+use alloc::CollectionAllocErr;
+use alloc::CollectionAllocErr::*;
+use boxed::Box;
 
 /// A low-level utility for more ergonomically allocating, reallocating, and deallocating
 /// a buffer of memory on the heap without having to worry about all the corner cases

src/liballoc/str.rs

@@ -46,12 +46,12 @@ use core::mem;
 use core::ptr;
 use core::iter::FusedIterator;
 
-use vec_deque::VecDeque;
 use borrow::{Borrow, ToOwned};
+use boxed::Box;
+use slice::{SliceConcatExt, SliceIndex};
 use string::String;
 use vec::Vec;
-use slice::{SliceConcatExt, SliceIndex};
-use boxed::Box;
+use vec_deque::VecDeque;
 
 #[stable(feature = "rust1", since = "1.0.0")]
 pub use core::str::{FromStr, Utf8Error};

src/liballoc/string.rs

@@ -66,11 +66,11 @@ use core::ptr;
 use core::str::pattern::Pattern;
 use core::str::lossy;
 
+use alloc::CollectionAllocErr;
 use borrow::{Cow, ToOwned};
+use boxed::Box;
 use str::{self, from_boxed_utf8_unchecked, FromStr, Utf8Error, Chars};
 use vec::Vec;
-use boxed::Box;
-use super::allocator::CollectionAllocErr;
 
 /// A UTF-8 encoded, growable string.
 ///

src/liballoc/vec.rs

@@ -82,11 +82,11 @@ use core::ptr;
 use core::ptr::NonNull;
 use core::slice;
 
+use alloc::CollectionAllocErr;
 use borrow::ToOwned;
 use borrow::Cow;
 use boxed::Box;
 use raw_vec::RawVec;
-use super::allocator::CollectionAllocErr;
 
 /// A contiguous growable array type, written `Vec<T>` but pronounced 'vector'.
 ///

src/liballoc/vec_deque.rs

@@ -30,10 +30,9 @@ use core::slice;
 use core::hash::{Hash, Hasher};
 use core::cmp;
 
+use alloc::CollectionAllocErr;
 use raw_vec::RawVec;
-
-use super::allocator::CollectionAllocErr;
-use super::vec::Vec;
+use vec::Vec;
 
 const INITIAL_CAPACITY: usize = 7; // 2^3 - 1
 const MINIMUM_CAPACITY: usize = 1; // 2 - 1