[AVR,testsuite,committed]: ad PR49868: Add more address-space tests

[Georg-Johann Lay]

Addes the following tests:

http://gcc.gnu.org/viewcvs?view=revision&revision=185570

        PR target/49868
        * gcc.target/avr/torture/addr-space-2.h: New file.
        * gcc.target/avr/torture/addr-space-2-g.h: New test.
        * gcc.target/avr/torture/addr-space-2-0.h: New test.
        * gcc.target/avr/torture/addr-space-2-1.h: New test.
        * gcc.target/avr/torture/addr-space-2-x.h: New test.