[PATCH] LibDriver, llvm-lib: introduce.

[Rafael Espíndola]

> I tried doing something similar at one point. IIRC the main stumbling block
> was a StringSaver that gets called under a lock in LLD for .drective, which
> was hard to disentangle for some reason.

I just noticed that.

Rui, do you remember why the lock was needed? Isn't the allocation
itself thread safe? Would it be sufficient to pass in an allocator
that used a std::mutex in Allocate?

I have attached the work in progress patches (builds and all tests pass).

Cheers,
Rafael
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