Note, the deprecated AArch64 -msign-return-address= does not accept b-key. So delete the incorrect tests.
The commit rL345273 by @LukeCheeseman has a missing test file, see https://reviews.llvm.org/D51429 This patch adds the missing test file. Patch by Luke Cheeseman Differential revision: https://reviews.llvm.org/D54148 llvm-svn: 346303