[patch] Simplify the datalayout strings by using the defaults

[Rafael Espíndola]

> Looks good to me, thanks.  If we don't want "a0:" to be used then
> maybe it would be worth changing:
>
> -  ``a0:0:64`` - aggregates are 64-bit aligned
>
> in LangRef.rst too.


Thanks. I have committed the bits That Richard and Tim reviewed or suggested.

A rebased patch with the remaining targets is attached.

Cheers,
Rafael
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