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Historically, space for struct k_thread was always carved out of the thread's stack region. However, we want more control on where this data will reside; in memory protection scenarios the stack may only be used for actual stack data and nothing else. On some platforms (particularly ARM), including kernel_arch_data.h from the toplevel kernel.h exposes intractable circular dependency issues. We create a new per-arch header "kernel_arch_thread.h" with very limited scope; it only defines the three data structures necessary to instantiate the arch-specific bits of a struct k_thread. Change-Id: I3a55b4ed4270512e58cf671f327bb033ad7f4a4f Signed-off-by: Andrew Boie <andrew.p.boie@intel.com>