First patch of patch series that improves MergeFunctions performance time from O(N*N) to

O(N*log(N)). The idea is to introduce total ordering among functions set.

That allows to build binary tree and perform function look-up procedure in O(log(N)) time.

This patch description:

Introduced total ordering among Type instances. Actually it is improvement for existing

isEquivalentType.

0. Coerce pointer of 0 address space to integer.

- If left and right types are equal (the same Type* value), return 0 (means equal).
- If types are of different kind (different type IDs). Return result of type IDs

comparison, treating them as numbers.

3. If types are vectors or integers, return result of its

pointers comparison (casted to numbers).

4. Check whether type ID belongs to the next group:

- Void
- Float
- Double
- X86_FP80
- FP128
- PPC_FP128
- Label
- Metadata

If so, return 0.

5. If left and right are pointers, return result of address space

comparison (numbers comparison).

6. If types are complex.

Then both LEFT and RIGHT will be expanded and their element types will be checked with

the same way. If we get Res != 0 on some stage, return it. Otherwise return 0.

7. For all other cases put llvm_unreachable.