[Patch AArch64 11/11] Enable _Float16

[James Greenhalgh]

Hi,

Finally, this patch adds the back-end wiring to get AArch64 support for
the _Float16 type working.

Bootstrapped on AArch64 with no issues.

OK?

Thanks,
James

---
2016-09-30  James Greenhalgh  <james.greenhalgh@arm.com>

	* config/aarch64/aarch64-c.c (aarch64_update_cpp_builtins): Update
	__FLT_EVAL_METHOD__ and __FLT_EVAL_METHOD_C99__ when we switch
	architecture levels.
	* config/aarch64/aarch64.c (aarch64_promoted_type): Only promote
	the aarch64_fp16_type_node, not all HFmode types.
	(aarch64_libgcc_floating_mode_supported_p): Support HFmode.
	(aarch64_scalar_mode_supported_p): Likewise.
	(aarch64_excess_precision): New.
	(TARGET_LIBGCC_FLOATING_MODE_SUPPORTED_P): Define.
	(TARGET_SCALAR_MODE_SUPPORTED_P): Likewise.
	(TARGET_C_EXCESS_PRECISION): Likewise.

2016-09-30  James Greenhalgh  <james.greenhalgh@arm.com>

	* gcc.target/aarch64/_Float16_1.c: New.
	* gcc.target/aarch64/_Float16_2.c: Likewise.
	* gcc.target/aarch64/_Float16_3.c: Likewise.

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