Move more stuff from cpu-defs.h to qom/cpu.h

This time, move jmp_env, opaque, mem_io_pc, mem_io_vaddr,
exception_index, tcg_exit_req. Note that the last one is not
used yet.

Change-Id: I3b14fd278feae0855bdd4a38eefd8170f404b82a
23 files changed