fn emit_clone_blob(
body: &mut InstrSeqBuilder<'_>,
runtime: &RuntimeFunctions,
memory_id: MemoryId,
source_pos: Option<MirSourcePos>,
fallback_line: i32,
source_local: LocalId,
total_bytes: u32,
alloc_site: i32,
scratch_i32_local: LocalId,
scratch_i32_local_b: LocalId,
dst_local: LocalId,
) -> Result<(), LowerError>