[patch] Split DataLayout and DataLayoutPass

[Rafael Espíndola]

New versions attached.

The patches are
* llvm1.patch: Just split DataLayout in DataLayout and DataLayoutPass.
(pretty much the previous patch).
* clang.patch: Update for the api change in llvm1.patch.
* llvm2.patch: Store a DataLayout in Module.

In llvm2.patch we still have to keep a std::string in Module in order
the C api to be able to return an owned pointer to a C string. What
the patch does is ensure that the string and the DataLayout object are
in sync.

I am still working on the third patch that should remove
DataLayoutPass and replace it with threading DataLayout to the places
that need it.

Cheers,
Rafael
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