Arm: Add HF modes to ANY iterators

Arm: Add HF modes to ANY iterators

The iterator ANY64 are used in various general split patterns and is supposed
to contain all 64 bit modes.

For some reason the pattern has HI but not HF.  This adds HF so that general
64 bit splits are generated for these modes as well.  These are required
by various split patterns that expect them to be there.

gcc/ChangeLog:

	PR target/88850
	* config/arm/iterators.md (ANY64): Add V4HF.

gcc/testsuite/ChangeLog:

	PR target/88850
	* gcc.target/arm/pr88850-2.c: New test.
	* lib/target-supports.exp
	(check_effective_target_arm_neon_softfp_fp16_ok_nocache,
	check_effective_target_arm_neon_softfp_fp16_ok,
	add_options_for_arm_neon_softfp_fp16): New.

From-SVN: r268884