[llvm-branch-commits] [clang] [llvm] [AArch64] Add a check for invalid default features (PR #104752)

[David Spickett via llvm-branch-commits]

DavidSpickett wrote:

> This adds a check that all ExtensionWithMArch which are marked as implied features for an architecture are also present in the list of default features.

And do I understand correctly that though this PR is titled "Add a check", it also fixes instances that the check discovered? So the backport is primarily to include those fixes rather than the check itself.

https://github.com/llvm/llvm-project/pull/104752