cpu: Define ArchCPU

For all targets, do this just before including exec/cpu-all.h.

Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Acked-by: Alistair Francis <alistair.francis@wdc.com>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>

target/sparc/cpu.h

@@ -730,6 +730,7 @@ static inline int cpu_pil_allowed(CPUSPARCState *env1, int pil)
 }
 
 typedef CPUSPARCState CPUArchState;
+typedef SPARCCPU ArchCPU;
 
 #include "exec/cpu-all.h"