Fix invalid pointer casts in arm64 implementation #24

Job	Run time
CI ubuntu-latest clang release shared no-glog	1m 11s
CI ubuntu-latest clang release static glog	1m 27s
CI ubuntu-latest clang release static no-glog	1m 9s
CI ubuntu-latest clang debug shared no-glog	1m 12s
CI ubuntu-latest clang debug static glog	1m 14s
CI ubuntu-latest clang debug static no-glog	1m 4s
CI macos-latest clang release shared no-glog	1m 15s
CI macos-latest clang release static glog	1m 18s
CI macos-latest clang release static no-glog	1m 7s
CI macos-latest clang debug shared no-glog	1m 0s
CI macos-latest clang debug static glog	1m 9s
CI macos-latest clang debug static no-glog	1m 0s
CI ubuntu-latest gcc release shared no-glog	1m 14s
CI ubuntu-latest gcc release static glog	1m 18s
CI ubuntu-latest gcc release static no-glog	1m 14s
CI ubuntu-latest gcc debug shared no-glog	1m 2s
CI ubuntu-latest gcc debug static glog	1m 13s
CI ubuntu-latest gcc debug static no-glog	57s
CI windows-latest msvc release static no-glog	3m 5s
CI windows-latest msvc debug static no-glog	2m 53s
	27m 2s

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