/// slice(n, m) - Chop off the first N elements of the array, and keep M
/// elements in the array.
MutableArrayRef<T> slice(unsigned N, unsigned M) const {
assert(N+M <= this->size() && "Invalid specifier");
return MutableArrayRef<T>(data()+N, M);
}
/// slice(n, m) - Chop off the first N elements of the array, and keep M
/// elements in the array.
MutableArrayRef<T> slice(unsigned N, unsigned M) const {
assert(N+M <= this->size() && "Invalid specifier");
return MutableArrayRef<T>(data()+N, M);
}