r337746 - [clang-cl] Expose -fblocks and -fno-builtin as driver flags

[Reid Kleckner via cfe-commits]

On Wed, Jul 25, 2018 at 4:39 AM Nico Weber <thakis at chromium.org> wrote:

> I thought about adding -fblocks when that thread happened, but since
> there's no runtime for them that just works exposing it doesn't seem very
> helpful. Maybe we should instead change the warning text to not suggest
> -fblocks when building on a non-mac target?
>

Someone linked to a github repo that has a Windows implementation of the
runtime. It may not be officially supported, but I don't see any reason to
throw up extra roadblocks.
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