[PATCH] [ELF] Implement .{ctors,dtors}.<priority> sections ordering

[Simon Atanasyan]

Hi Bigcheese, shankarke, ruiu,

In general .ctors/.dtors sections might be considered as obsoleted but they still used on some target platforms like MIPS and maybe others.

Let's support ordering of such sections.

http://reviews.llvm.org/D3921

Files:
  lib/ReaderWriter/ELF/CMakeLists.txt
  lib/ReaderWriter/ELF/CtorsOrderPass.cpp
  lib/ReaderWriter/ELF/CtorsOrderPass.h
  lib/ReaderWriter/ELF/DefaultLayout.h
  lib/ReaderWriter/ELF/ELFLinkingContext.cpp
  test/elf/ctors-order.test
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