[ARM, testsuite] Add -mfloat-abi=hard to arm_neon_ok

[ARM, testsuite] Add -mfloat-abi=hard to arm_neon_ok

2017-06-02  Christophe Lyon  <christophe.lyon@linaro.org>

	gcc/testsuite/
	* lib/target-supports.exp
	(check_effective_target_arm_neon_ok_nocache): Add flags with
	-mfloat-abi=hard. Include arm_neon.h.
	(check_effective_target_arm_neon_ok_no_float_abi_nocache): New.
	(check_effective_target_arm_neon_ok_no_float_abi): New.
	* gcc.target/arm/lto/pr65837_0.c: Require
	arm_neon_ok_no_float_abi. Add -mfpu=neon to dg-lto-options.
	* gcc.target/arm/lto/pr65837-attr_0.c: Require
	arm_neon_ok_no_float_abi. Remove dg-suppress-ld-options.

	gcc/
	* doc/sourcebuild.texi (ARM-specific attributes): Document new
	arm_neon_ok_no_float_abi effective target.

From-SVN: r249639