Support for a new pacbti unwind opcode. This patch adds readelf support for decoding the exception table opcode for restoring the RA_AUTH_CODE pseudo register defined by the EHABI (https://github.com/ARM-software/abi-aa/releases/download/2021Q1/ehabi32.pdf Section 10.3). * readelf.c (decode_arm_unwind_bytecode): Add support to decode restoring RA_AUTH_CODE pseudo register.