[arm] Avoid STRD with odd register for TARGET_ARM in output_move_double

[arm] Avoid STRD with odd register for TARGET_ARM in output_move_double

2018-10-01  Kyrylo Tkachov  <kyrylo.tkachov@arm.com>

	Backport from mainline
	2018-06-29  Kyrylo Tkachov  <kyrylo.tkachov@arm.com>

	* config/arm/arm.c (output_move_double): Don't allow STRD instructions
	if starting source register is not even.

	Backport from mainline
	2018-07-02  Christophe Lyon  <christophe.lyon@linaro.org>

	* gcc.target/arm/arm-soft-strd-even.c: Skip if -mfloat-abi is
	overriden.
	2018-06-29  Kyrylo Tkachov  <kyrylo.tkachov@arm.com>

	* gcc.target/arm/arm-soft-strd-even.c: New test.

From-SVN: r264746