[avr, 6, 5, 4.9, committed] Backported PR target/71103

[Georg-Johann Lay]

Applied backports to:

v6: https://gcc.gnu.org/r237591
v5: https://gcc.gnu.org/r237593
v4.9: https://gcc.gnu.org/r237594

Johann


gcc/
	Backport from 2016-06-20 trunk r237589, r236558.

	PR target/71103
	* config/avr/avr.md (movqi): Handle loading subreg:qi (const,
	symbol_ref,label_ref).

gcc/testsuite/
	Backport from 2016-06-20 trunk r237589, r236558.

	PR target/71103
	* gcc.target/avr/pr71103.c: New test.
	* gcc.target/avr/torture/pr71103-2.c: New test.

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