[Patch 8/11] Make _Float16 available if HFmode is available

[James Greenhalgh]

Hi,

Now that we've worked on -fexcess-precision, the comment in targhooks.c
no longer holds. We can now permit _Float16 on any target which provides
HFmode and supports HFmode in libgcc.

Bootstrapped and tested on x86-64, and in series on AArch64.

OK?

Thanks,
James

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

	* targhooks.c (default_floatn_mode): Enable _Float16 if a target
	provides HFmode.

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