[ARM] PR98636 - ICE on passing incompatible options for fp16

[Prathamesh Kulkarni via Gcc-patches]

Hi,
The attached patch fixes the issue mentioned in PR, by adding
arm_fp16_format to checked_options in optc-save-gen.awk.
Is this OK to commit in stage-4 if testing passes or should we hold it
till next stage-1 ?

Thanks,
Prathamesh

pr98636-2.diff
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