[PATCH 00/11] aarch64: New feature flags and flag fixes

[Andrew Carlotti]

This patch series adds new feature flags for instructions that are already
present in Binutils, to allow the instructions to be enabled without specifying
a higher architecture version.  With the exception of patch 11/11 (cleaning up
dead code), each patch is independent of the others.

Aside from adding new feature flags (or otherwise eliminating architecture
version dependencies), there are also three small bug fixes, in patches 1/11,
3/11 and 9/11.

I have run the tests affected by each commit after that commit, and I have also
run the entire testsuite on the series as a whole, with no test failures.  Is
this ok for master?  I don't have write access, so will need help to commit
these.