[PATCH] x86-64: Align the stack in __tls_get_addr [BZ #21609]

[Alexander Monakov]

On Thu, 6 Jul 2017, Carlos O'Donell wrote:
> Option (b) has been chosen for this release, so that's what we're doing for
> the release, but we can continue to discuss the optimization here.
> 
> (1) Cost.
> 
> No matter what you do it's extra instructions on the hot path forever.

What extra instructions on the hot path?  I don't see any.  There's no
need to check stack alignment on the hot path -- only on the slow path.

Alexadner