[AArch64][PAC] Reset `killed` operand flags in outlined functions (#221041) Presently, MachineOutliner does not take `killed` operand flags into account when merging instruction sequences. While it sounds perfectly reasonable not to inhibit merging of the instruction sequences that only differ in `killed` flags (for N flags there is technically 2^N valid ways to drop some subset of them), copying these flags from an arbitrarily chosen representative instruction may result in incorrect codegen of PAuth-related pseudo instructions on AArch64. To keep `killed` flags conservatively correct as if `OUTLINED_FUNCTION`s are virtually re-inserted at every call site, this patch takes the simplest approach of resetting every `killed` flag inside the outlined functions.
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