Use temporary files in lto

[Rui Ueyama via llvm-commits]

I can run this on Windows for you.

On Thu, Apr 28, 2016 at 4:23 PM, Rafael Espíndola <
llvm-commits at lists.llvm.org> wrote:

> This is the idea we chatted today to try to avoid mallocs os windows.
> I was surprised to find this a small speedup up on linux (with /tmp in
> tmpfs), so I wonder if we are doing something funny in SmallVector.
>
> Linking llvm-as I got
>
> master: 29.774786873 seconds
> patch 29.752283093 seconds
>
> Could one of you benchmark this on windows? If it is a performance win
> there too I will clean the patch up and send for proper review.
>
> Cheers,
> Rafael
>
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