[AArch64][SVE] Use SVE for scalar FP converts in streaming[-compatible] functions (1/n)#118505
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In streaming[-compatible] functions, use SVE for scalar FP conversions to/from integer types. This can help avoid moves between FPRs and GRPs, which could be costly.
This patch also updates definitions of SCVTF_ZPmZ_StoD and UCVTF_ZPmZ_StoD to disallow lowering to them from ISD nodes, as doing so requires creating a [U|S]INT_TO_FP_MERGE_PASSTHRU node with inconsistent types.
Follow up to #112213.
Note: This PR does not include support for f64 <-> i32 conversions (like #112564), which needs a bit more work to support.