Mark sk_abort_no_print [[noreturn]].

It isn't expected that sk_abort_no_print should return (it should
abort). This also allows removal of the SkUNREACHABLE from SK_ABORT.

Also make sk_abort_no_print actually not able to return.

Change-Id: Ibd5eda019820ed7e91de37a048efdfb0d1097aff
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/306188
Reviewed-by: Mike Klein <mtklein@google.com>
Reviewed-by: Brian Salomon <bsalomon@google.com>
Commit-Queue: Ben Wagner <bungeman@google.com>
2 files changed