[patch] Split DataLayout and DataLayoutPass

[Rafael Espíndola]

Updated patches attached.

* llvm1.patch: Just split DataLayout in DataLayout and DataLayoutPass.
* clang1patch: Update for the llvm api change in llvm1.patch

* llvm2.patch: Store a DataLayout in Module.

* llvm3.patch: Delete DataLayoutPass.
* clang3.patch: Update for api changes in llvm3.patch.

The third patch still needs some polish and spitting, but it does pass
check-all, so it shows that the approach work.

Chandler, are you OK with patches 1 and 2 going in now and me
finishing up the third one next week?

Cheers,
Rafael
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