[PATCH][Arm] Fix FPU configurations for Cortex-R7 and Cortex-R8

[Andre Vieira (lists)]

Hi,

This patch fixes the FPU configurations of Cortex-R7 and Cortex-R8,
enabling the use of FP16 conversion instructions for both and adding the
option to disable double precision instruction support using '+nofp.dp'.

Passes the self-check during building for an arm target.

Is this OK for trunk?

And could I also backport this to GCC-8?

gcc/ChangeLog:
2018-11-27  Andre Vieira  <andre.simoesdiasvieira@arm.com>

        * config/arm/arm-cpus.in (armv7-r): Add FP16conv configurations.
        (cortex-r8, cortex-r7): Update default and add new configuration.
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