[Patch AArch64 obvious] Fix expected string for fp16 extensions

[James Greenhalgh <james.greenhalgh@arm.com>]

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Hi,

As currently coded, the native detection of the fp16 architecture extension
from the ARMv8.2-A extensions looks for the string "fp16", but the kernel
exposes support of these features through two strings "fphp, for scalar
16-bit floating point support, and "asimdhp" for vector 16-bit floating-point
support [1].

This patch fixes the string we look for, looking for the pair of both
fphp and asimdhp.

I have no platform to test this on, so my testing is to show that it builds
and correctly enables the fp16 extension when given a faked up /proc/cpuinfo

I've committed this as obvious to trunk (as revision 249411) and gcc-7-branch
(as revision 249413).

Thanks,
James

[1] Patchwork arm64: Add support for Half precision floating point
    https://patchwork.kernel.org/patch/8124451/

---
2017-06-20  James Greenhalgh  <james.greenhalgh@arm.com>

	* config/aarch64/aarch64-option-extensions.def (fp16): Fix expected
	feature string.


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diff --git a/gcc/config/aarch64/aarch64-option-extensions.def b/gcc/config/aarch64/aarch64-option-extensions.def
index 36766d9..b54de03 100644
--- a/gcc/config/aarch64/aarch64-option-extensions.def
+++ b/gcc/config/aarch64/aarch64-option-extensions.def
@@ -58,6 +58,6 @@ AARCH64_OPT_EXTENSION("lse", AARCH64_FL_LSE, 0, 0, "atomics")
 
 /* Enabling "fp16" also enables "fp".
    Disabling "fp16" just disables "fp16".  */
-AARCH64_OPT_EXTENSION("fp16", AARCH64_FL_F16, AARCH64_FL_FP, 0, "fp16")
+AARCH64_OPT_EXTENSION("fp16", AARCH64_FL_F16, AARCH64_FL_FP, 0, "fphp asimdhp")
 
 #undef AARCH64_OPT_EXTENSION