[PATCH 4/17][ARM] Define feature macros for FP16.

[Matthew Wahab]

The FP16 extension introduced with the ARMv8.2-A architecture adds
instructions operating on FP16 values to the VFP and NEON instruction
sets.

The patch adds the feature macro __ARM_FEATURE_FP16_SCALAR_ARITHMETIC
which is defined to be 1 if the VFP FP16 instructions are available; it
is otherwise undefined.

The patch also adds the feature macro __ARM_FEATURE_FP16_VECTOR_ARITHMETIC
which is defined to be 1 if the NEON FP16 instructions are available; it
is otherwise undefined.

These two macros will appear in a future version of the ACLE.

Tested the series for arm-none-linux-gnueabihf with native bootstrap and
make check and for arm-none-eabi and armeb-none-eabi with make check on
an ARMv8.2-A emulator.

Ok for trunk?
Matthew

2016-05-17  Matthew Wahab  <matthew.wahab@arm.com>

	* config/arm/arm-c.c (arm_cpu_builtins): Define
	"__ARM_FEATURE_FP16_SCALAR_ARITHMETIC" and
	"__ARM_FEATURE_FP16_VECTOR_ARITHMETIC".

testsuite/
2016-05-17  Matthew Wahab  <matthew.wahab@arm.com>

	* gcc.target/arm/attr-fp16-arith-1.c: New.

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