gdb/testsuite: Add gdb.arch/aarch64-sve-sigunwind.exp

There's currently no test for unwinding the SVE registers from a signal
frame, so add one.

Tested on aarch64-linux-gnu native.

Tested-By: Luis Machado <luis.machado@arm.com>
Approved-By: Luis Machado <luis.machado@arm.com>
2 files changed