Refactor X86 symbol access classification

[Rafael Espíndola via llvm-commits]

Rebased patch attached.

On 19 May 2016 at 15:50, Rafael Espíndola <rafael.espindola at gmail.com> wrote:
> Refactor X86 symbol access classification.
>
> This refactors the logic in X86 to avoid code duplication. It also
> splits it in two steps: it first decides if a symbol is local to the
> DSO and then uses that information to decide how to access it.
>
> The first part is implemented by shouldAssumeDSOLocal. It is not in
> any way specific to X86. In a followup patch I intend to move it to
> somewhere common and reused it in other backends.
>
> Cheers,
> Rafael
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