[PATCH] Fix LTO handling of symbols in the .symver directive

[Rafael Espíndola]

LGTM

On 27 March 2014 18:41, Tom Roeder <tmroeder at google.com> wrote:
> This patch fixes LTO's RecordStreamer so that it records symbols in the
> MCExpr part of an asm .symver directive as being used. This prevents
> referenced functions from being internalized and deleted.  This happens,
> e.g., in libaio (http://lse.sourceforge.net/io/aio.html).
>
> Without this patch, the attached test case will cause LLVM to produce the
> error:
>
> LLVM ERROR: A @@ version cannot be undefined.
>
> Please let me know what you think.
>
> Thanks,
>
> Tom
>
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