[AArch64] Correct position of CFI Instruction for Pointer Authentication (#121559) As part #112171, support for FEAT_PAuthLR's CFI instructions was added. However, the CFI instructions are emitted in the incorrect location. This leads to incorrect CodeGen being generated and possible issues when running a program. According to the ABI, the CFI instructions should be emitted before the signing instruction. This is now done properly. ABI information can be found here: https://github.com/ARM-software/abi-aa/blob/bf0e2c8047c70987165f3e05e571d7836370ade9/aadwarf64/aadwarf64.rst#44call-frame-instructions
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