[LegalizeVectorTypes] Don't emit VP_SELECT when widening MLOAD to VP_LOAD (#179478) This is part of the work to remove trivial VP intrinsics. When widening an MLOAD we may use a VP_LOAD if it's supported. We use a VP_SELECT to merge in the passthru, but we don't check if it's supported by the target. This changes it to just emit a regular VSELECT instead to prevent crashing in that case, and a VP_MERGE to keep the lanes past EVL poison.
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