aemerson wrote:

@efriedma-quic @francisvm Can we restore this change? We need this for security 
hardening purposes to prevent LR allocated for general uses.

(There is also an issue with reserving LR in that AArch64's PEI doesn't add 
live-in flags for reserved regs, but I think we should fix that there once we 
restore this feature).

https://github.com/llvm/llvm-project/pull/88019
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