[PATCH] LLD: Implement our own future and use that for FileArchive::preload().

[Rui Ueyama]

std::promise and std::future in old version of libstdc++ are buggy.
I think that's the reason why LLD tests was flaky on Ubuntu 13
buildbots until we disable file preloading.

In this patch, I implemented very simple future and used that in
FileArchive. Compared to std::promise and std::futureu, it lacks
many features, but should suffice for our purpose.

http://reviews.llvm.org/D8025

Files:
  include/lld/Core/Parallel.h
  lib/Core/Resolver.cpp
  lib/ReaderWriter/FileArchive.cpp

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