Avoid overlapping buffers in native ChaCha20 #120

Job	Run time
Select platforms	1s
linux-x64-hs-nopch / build (debug)	1m 57s
linux-x64 / build (debug)	2m 1s
linux-x64 / build (release)	2m 9s
linux-x64-hs-zero / build (debug)	2m 1s
linux-x64-hs-optimized / build (debug)	1m 51s
linux-x64-hs-minimal / build (debug)	1m 57s
linux-x86 / build (debug)	2m 12s
macos-aarch64 / build (debug)	4m 4s
linux-x86 / build (release)	2m 7s
macos-aarch64 / build (release)	4m 4s
macos-x64 / build (debug)	3m 9s
macos-x64 / build (release)	3m 20s
windows-aarch64 / build (debug)	4m 57s
windows-aarch64 / build (release)	4m 2s
windows-x64 / build (debug)	4m 37s
windows-x64 / build (release)	4m 56s
linux-x64	0s
linux-cross-compile	0s
linux-x86	0s
macos-x64	0s
windows-x64	0s
Remove bundle artifacts	4s
	49m 29s

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