[libcxxabi patch] Fix minor initialization bug in Registers_x86_64

[Nick Kledzik]

On Dec 5, 2013, at 3:41 PM, Nico Weber <thakis at chromium.org> wrote:

> Hi,
> 
> here's a minor 1-line patch that fixes what seems to be a bug in the Registers_arm64 constructor. All libcxxabi tests still pass with this change.
 LGTM.

That constructor is not actually used for exception processing, so that code path was not exercised.

-Nick