[patch] Use ld.lld2 as a argv[0] alias

[Rui Ueyama via llvm-commits]

I'd use StringRef::endswith_lower instead of path::extension (why do we
have that function btw?). There are two spaces after ld.lld2. Otherwise
LGTM.

On Thu, Oct 1, 2015 at 3:36 PM, Rafael Espíndola <rafael.espindola at gmail.com
> wrote:

> The reason for the name is so that we can run
>
> ./build/bin/clang -fuse-ld=lld2 test.o -o t
>
>
> Cheers,
> Rafael
>
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