Commits on Feb 19, 2022

1. No branch protection metadata unless enabled …

   Even if we emit metadata disabling branch protection, this metadata may
   conflict with other modules (e.g. during LTO) that have different branch
   protection metadata set.
   
   This is an unstable flag and feature, so ideally the flag not being
   specified should act as if the feature wasn't implemented in the first
   place.
   
   Additionally this PR also ensures we emit an error if
   `-Zbranch-protection` is set on targets other than the supported
   aarch64. For now the error is being output from codegen, but ideally it
   should be moved to earlier in the pipeline before stabilization.

   

   nagisa committed Feb 19, 2022
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