Merge branch 'for-next/stacktrace' into for-next/kasan

Merge in stack unwinding work to cater for 8-byte aligned stack frames
which may be generated following optimisations to CONFIG_KASAN_OUTLINE.

* for-next/stacktrace:
  arm64: stacktrace: Relax frame record alignment requirement to 8 bytes
  arm64: Change the on_*stack functions to take a size argument
  arm64: Implement stack trace termination record