[AArch64] Give a higher cost for more expensive SVE FCMP instructions (#153816)

This tries to add a higher cost for SVE FCM** comparison instructions
that often have a lower throughput than the Neon equivalents that can be
executed on more vector pipelines.

This patch takes the slightly unorthodox approach of using the
information in the scheduling model to compare the throughput of a
FCMEQ_PPzZZ_S (SVE) and a FCMEQv4f32 (Neon). This isn't how things will
(probably) want to work in the long run, where all the information comes
more directly from the scheduling model, but that still needs to be
proven out. The downsides of this approach of using the scheduling model
info is if the core does not have a scheduling model but wants a
different cost - then an alternative approach will be needed (but then
maybe that is a good reason to create a new scheduling model).

The alternative would either be to make a subtarget feature for the
affected cores or just always enable it.

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