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

[Rafael Ávila de Espíndola]

LGTM in that

- It is clear from how linkers behave that something has to be done to sort the entries for Mips.
- The api change is reasonable: making sortRelocs virtual.


REPOSITORY
  rL LLVM

http://reviews.llvm.org/D7414

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