Upgrade arm64 cross image to Ubuntu 22.04 / llvm-15 #83939
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This image is based on Ubuntu 22.04 instead of 20.04 with llvm-15 toolchain instead of llvm-9 in the host layer. It has the same Ubuntu 16.04 (which we lowered in #80939) in
/crossrootfs
dir. See dotnet/dotnet-buildtools-prereqs-docker#815.llvm9 has a bug in
llvm-objcopy
which causes the size regression (#49081), it was fixed in llvm10. That means we can bring crossgen2's NativeAOTlinux-arm64
publishing to the same plan aslinux-musl-arm64
with this update. Hence the change in sfxproj.