[SLP] getVectorCallCosts - don't provide scalar argument data for vector IntrinsicCostAttributes (#124254)

getVectorCallCosts determines the cost of a vector intrinsic, based off
an existing scalar intrinsic call - but we were including the scalar
argument data to the IntrinsicCostAttributes, which meant that not only
was the cost calculation not type-only based, it was making incorrect
assumptions about constant values etc.

This also exposed an issue that x86 relied on fallback calculations for
funnel shift costs - this is great when we have the argument data as
that improves the accuracy of uniform shift amounts etc., but meant that
type-only costs would default to Cost=2 for all custom lowered funnel
shifts, which was far too cheap.

This is the reverse of #124129 where we weren't including argument data
when we could.

Fixes #63980

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