Function realloc 

pub fn realloc<'c>(
    context: &'c Context,
    value: Value<'c, '_>,
    size: Option<Value<'c, '_>>,
    type: MemRefType<'c>,
    alignment: Option<IntegerAttribute<'c>>,
    location: Location<'c>,
) -> Operation<'c>

Create a memref.realloc operation.