Add shift and remove methods for Vec
Vec: remove the drop flag to make it no larger than (*T, uint, uint).
Update last_span in replace_token
Suggest explicit lifetime parameter on some errors

Some types of error are caused by missing lifetime parameter on function
or method declaration. In such cases, this commit generates some
suggestion about what the function declaration could be. This does not
support method declaration yet.
enable mutex lowering and hardware floating point on gnueabihf. closes #10482
auto merge of #12845 : eddyb/rust/vec-no-drop-flag, r=thestinger
Remove Rc's borrow method to avoid conflicts with RefCell's borrow in Rc<RefCell<T>>.
Implement automatic overloaded dereference.
Closes #7141.
Introduce a common recursion limit for auto-dereference and monomorphization.
Apply @nikomatsakis' nits and comments patch.
Region + borrow checker support and tests for overloaded autoderef.
compile-fail: Beef up borrowck test to include some scenarios where we borrow mutably twice in a row
Tweak comments
auto merge of #12610 : eddyb/rust/deref-now-auto, r=nikomatsakis

Enables the dereference overloads introduced by #12491 to be applied wherever automatic dereferences would be used (field accesses, method calls and indexing).
auto merge of #12849 : nick29581/rust/doubles, r=alexcrichton
auto merge of #12852 : itdaniher/rust/master, r=alexcrichton

This enables the lowering of llvm 64b intrinsics to hardware ops, resolving issues around `__kernel_cmpxchg64` on older kernels on ARM devices, and also enables use of the hardware floating point unit, resolving https://github.com/mozilla/rust/issues/10482.
auto merge of #12238 : ktt3ja/rust/lifetime-error-msg, r=nikomatsakis

For the following code snippet:

```rust
struct Foo { bar: int }
fn foo1(x: &Foo) -> &int {
    &x.bar
}
```

This PR generates the following error message:

```rust
test.rs:2:1: 4:2 note: consider using an explicit lifetime parameter as shown: fn foo1<'a>(x: &'a Foo) -> &'a int
test.rs:2 fn foo1(x: &Foo) -> &int {
test.rs:3     &x.bar
test.rs:4 }
test.rs:3:5: 3:11 error: cannot infer an appropriate lifetime for borrow expression due to conflicting requirements
test.rs:3     &x.bar
              ^~~~~~
```

Currently it does not support methods.