Methodize TypeNames
Change calls for TypeName stuff to methods
Make log_fn_time a method
Start refacting LLVM Type handling
More Type refactorings
Add the rest of the atomic operations.

This makes the handling of atomic operations more generic, which
does impose a specific naming convention for the intrinsics, but
that seems ok with me, rather than having an individual case for
each name.

It also adds the intrinsics to the the intrinsics file.
Initial Type Refactoring done
Finish up Type refactoring
Fix warnings in trans
auto merge of #7182 : Aatch/rust/trans-refactor-pt2, r=graydon

This is another big refactoring of `trans` though this is unlikely to have much of an
impact on code size or speed.

The major change here is the implementation of a `Type` struct which is the new
home for all your LLVM `TypeRef` needs. It's a simple wrapper struct, with static
methods for constructing types, then regular methods for
manipulating/interrogating them. The purpose of this is mostly to make the code
surrounding them somewhat more ideomatic. A line like: `T_ptr(T_ptr(T_i8()))` is 
now `Type::i8().ptr_to().ptr_to()`,which is much more like regular Rust code.

There are a variety of smaller changes here and there:

* Remove address spaces. At least it doesn't generate them, I haven't spent much
  time looking for related code.
* Use a macro for declaring the LLVM intrinsics, makes it look much nicer.
* Make the type for a string slice actually create a named `str_slice` type in LLVM,
  this makes reading the appropriate code much easier.
* Change the way struct and enum type names are generated. This just means
  that a struct like `struct Foo { a: int }` now produces the IR 
  `%struct.Foo = type { i64 }`, which is much easier to read. Similarly, other structs
  are a bit tighter to make it easier to read.

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This PR did get away from me a little, as I occasionally got distracted or as I fixed
up problems with unrelated code that were stopping me from continuing. One major
thing is that this PR contains the work from #7168, since that would have conflicted
with this and it was broken anyway. Sorry for bundling it like this.

Fixes #3670 and #7063

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EDIT: This no longer removes the llvm insn stats.