[patch][pr22217] Use the most recent decl for mangling

[Rafael Espíndola]

Sorry, I attached an older version of the patch. This one has a
slightly simpler test.

On 20 January 2015 at 10:29, Rafael Espíndola
<rafael.espindola at gmail.com> wrote:
> Currently clang will produce a @foo when given
>
> int foo;
> extern int foo __asm__("bar");
>
> The attached patch makes it produce a @bar, which is what gcc produces.
>
> I am confused by the output changes in the microsoft abi tests.
> Hopefully someone more familiar with it can comment on why using a
> more recent decl causes problems and has an idea of what should be
> changed to accommodate it.
>
> Cheers,
> Rafael
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