[PATCH] aarch64: Add default cfi rule to restore SP from CFA address.

[Mark Wielaard]

On Wed, 2018-04-11 at 10:47 +0200, Mark Wielaard wrote:
> The CFA is set by default to the stack pointer of the previous frame.
> So that is also how we can always restore the SP. This default aarch64
> CFI rule is necessary on Fedora 28 with GCC8 to make the run-deleted.sh
> and run-backtrace-dwarf.sh testcases work.

Pushed to master.