[PATCH] Re-enable a hook in MCELFObjectTargetWriter to allow target-specific relocationtable sorting and use this hook for Mips.

[Vladimir Stefanovic]

In http://reviews.llvm.org/D7414#147888, @rafael wrote:

> > > Still not there. Which relocation gets matched to another is part of
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> > >   of the semantics of the assembly file. We have to match gas or
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> > >   document that we are incompatible.
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> > Copied the sentence from the generic sortRelocs().
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> That is a very different case. That is about ELF, not mips-ELF.
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> On ELF, the order is not important, and we just need to make sure it
>  is deterministic. On mips-ELF it is part of the semantics of the .o.


//// There may be more ways to sort the table while respecting the ABI rule;
//// we always sort the same way gnu as does, for compatibility.


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