[RFA/i386]: Enable default support for SSE registers

[Mark Kettenis]

Kevin Buettner <kevinb@redhat.com> writes:

> Ping?

Sorry, I've been on a vacation, and didn't read your message until
yesterday.  There is one more concern that I do have: If we include
the SSE registers, we somehow should also set their values to
something sensible for targets that don't support them.  We already do
this for Linux, but it makes more sense to add some code to
i387_supply_fsave().

Go ahead and check this in on mainline.  Do you want it on the 6.0
branch too?

Mark