pub(crate) fn emit_pointer_alloc(
body: &mut InstrSeqBuilder<'_>,
runtime: &RuntimeFunctions,
memory_id: MemoryId,
source_pos: Option<MirSourcePos>,
fallback_line: i32,
src_local: LocalId,
src_ty: ValType,
dst_local: LocalId,
) -> Result<(), LowerError>