[PATCH] [Object] Support reading 64-bit MIPS ELF archives

[Simon Atanasyan]

Hi rafael,

The 64-bit MIPS ELF archive file format is used by MIPS64 targets. The main difference from a regular archive file is the symbol table format:
* ar_name is equal to "/SYM64/"
* number of symbols and offsets are 64-bit integers

[64-bit ELF Object File Specification. Page 96](http://techpubs.sgi.com/library/manuals/4000/007-4658-001/pdf/007-4658-001.pdf)

The patch allows reading of such archive files by llvm-nm, llvm-objdump and other tools. But it does not support archive files with number of symbols and/or offsets exceed 2^32. I think it is a rather rare case requires more significant modification of the `Archive` class code.

REPOSITORY
  rL LLVM

http://reviews.llvm.org/D7546

Files:
  include/llvm/Object/Archive.h
  lib/Object/Archive.cpp
  test/Object/Inputs/archive-test.a-irix6-mips64el
  test/Object/nm-irix6.test

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