[patch] Add doInitialization/doFinalization to DataLayoutPass

[Rafael Espíndola]

Dmitri noticed that in r202168 doFinalization got dropped from the
DataLayoutPass.

If we are going to add it back, it is probably a good idea to add
doInitialization too. With that a DataLayoutPass can be reused for
multiple modules.

Once we have doInitialization/doFinalization, it doesn't seem
necessary to pass a Module to the constructor.

Overall this change seems in line with the idea of making DataLayout a
required part of Module. With it the only way of having a DataLayout
used is to add it to the Module.

Cheers,
Rafael
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