[sparc64] Add patches to fix user stack sync and add clone3() syscall

John Paul Adrian Glaubitzrequested to merge
glaubitz/linux:sparc64-clone3 into debian/latest

These two cherry-picked upstream patches address two issues:

  • Fix an issues where the user stack would become out-of-sync causing clone and fork to fail
  • Add support for the clone3() syscall on sparc64

Both patches have already been merged into Linus' tree for the upcoming 7.0 kernel.

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