[SVE] Ensure SVE call operands passed via memory are correctly initialised. (#66070)

The stores created when passing operands via memory don't typically
maintain the chain, because they can be done in any order. Instead,
a new chain is created based on all collated stores. SVE parameters
passed via memory don't follow this idiom and try to maintain the
chain, which unfortunately can result in them being incorrectly
deadcoded when the chain is recreated.

This patch brings the SVE side in line with the non-SVE side to
ensure no stores become lost whilst also allowing greater flexibility
when ordering the stores.