[ARM] Fix, add tests for FP16 aapcs.

[Matthew Wahab]

Hello,

A number of tests were added to check for FP16 arguments and return
values being passed in registers. These require mfloat-abi=hard to be
selected but in some test configurations they were run with
-mfloat-abi=soft or -mfloat-abi=softfp.

Explict skip-if directives are added to the tests to ensure that they
only run on valid configurations. In addition, the code in the
gcc.target/arm/fp16-aapcs-1.c test is reworked to focus on argument
passing and return values and a softfp variant is added as
fp16-aapcs-2.c.

Tested for arm-none-linux-gnueabihf with native make check and for
arm-none-eabi with cross-compiled check-gcc. Also checked the new tests
with cross-compiled arm-eabi-qemu/-mcpu=cortex-m3/-mthumb.

Ok for trunk?
Matthew

2016-06-09  Matthew Wahab  <matthew.wahab@arm.com>

	* testsuite/gcc.target/arm/aapcs/neon-vect10.c: Skip for
	mfloat-abi=soft and mfloat-abi=softfp.  Replace arm_neon_fp16_ok
	with arm_neon_fp16_hw.
	* testsuite/gcc.target/arm/aapcs/neon-vect9.c: Likewise.
	* testsuite/gcc.target/arm/aapcs/vfp18.c: Likewise.
	* testsuite/gcc.target/arm/aapcs/vfp19.c: Likewise.
	* testsuite/gcc.target/arm/aapcs/vfp20.c: Likewise.
	* testsuite/gcc.target/arm/aapcs/vfp21.c: Likewise.
	* testsuite/gcc.target/arm/fp16-aapcs-1.c: Skip for
	mfloat-abi=soft and mfloat-abi=softfp.  Also, simplify the test
	and set option -mfloat-abi=hard.
	* testsuite/gcc.target/arm/fp16-aapcs-2.c: New.
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