target/avr: Add instruction translation - CPU main translation function

target/avr: Add instruction translation - CPU main translation function

Add the core of translation mechanism.

Co-developed-by: Richard Henderson <[email protected]>
Co-developed-by: Michael Rolnik <[email protected]>
Signed-off-by: Michael Rolnik <[email protected]>
Signed-off-by: Richard Henderson <[email protected]>
Signed-off-by: Aleksandar Markovic <[email protected]>
Tested-by: Philippe Mathieu-Daudé <[email protected]>
Reviewed-by: Aleksandar Markovic <[email protected]>
Signed-off-by: Thomas Huth <[email protected]>
Message-Id: <20200705140315[email protected]>
Signed-off-by: Philippe Mathieu-Daudé <[email protected]>