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[AArch64] Indirect tail-calls cannot use x16 with pac-ret+pc (llvm#81020
) When using -mbranch-protection=pac-ret+pc, x16 is used in the function epilogue to hold the address of the signing instruction. This is used by a HINT instruction which can only use x16, so we can't change this. This means that we can't use it to hold the function pointer for an indirect tail-call. There is existing code to force indirect tail-calls to use x16 or x17 when BTI is enabled, so there are now 4 combinations: bti pac-ret+pc Valid function pointer registers off off Any non callee-saved register on off x16 or x17 off on Any non callee-saved register except x16 on on x17
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