tcg: Pass last_tb by value to tb_find_fast()
This is a small clean up. tb_find_fast() is a final consumer of this variable so no need to pass it by reference. 'last_tb' is always updated by subsequent cpu_loop_exec_tb() in cpu_exec(). This change also simplifies calling cpu_exec_nocache() in cpu_handle_exception(). Signed-off-by: NSergey Fedorov <serge.fdrv@gmail.com> Signed-off-by: NSergey Fedorov <sergey.fedorov@linaro.org> Message-Id: <20160715175852.30749-3-sergey.fedorov@linaro.org> Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com>
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