hashmap: rm linear namespace

doc/rust.md

@@ -441,7 +441,7 @@ expression context, the final namespace qualifier is omitted.
 Two examples of paths with type arguments:
 
 ~~~~
-# use core::hashmap::linear::LinearMap;
+# use core::hashmap::LinearMap;
 # fn f() {
 # fn id<T:Copy>(t: T) -> T { t }
 type t = LinearMap<int,~str>;  // Type arguments used in a type expression

doc/tutorial.md

@@ -1888,7 +1888,7 @@ illegal to copy and pass by value.
 Generic `type`, `struct`, and `enum` declarations follow the same pattern:
 
 ~~~~
-# use core::hashmap::linear::LinearMap;
+# use core::hashmap::LinearMap;
 type Set<T> = LinearMap<T, ()>;
 
 struct Stack<T> {

src/libcore/gc.rs

@@ -43,7 +43,7 @@ use io;
 use libc::{size_t, uintptr_t};
 use option::{None, Option, Some};
 use ptr;
-use hashmap::linear::LinearSet;
+use hashmap::LinearSet;
 use stackwalk;
 use sys;