This reverts commit c8b4cc2ff9cf15a42f95b2302e02431a0004f5c8.
This includes many C++ standard library headers:
#include <algorithm>
#include <chrono>
#include <ctime>
#include <iomanip>
#include <ios>
#include <iostream>
#include <memory>
#include <sstream>
#include <string>
#include <tuple>
#include <type_traits>
#include <vector>
which adds more than a second of compile time for each file that
includes the header:
ir.cpp before: 8.041s
ir.cpp after: 6.847s
26546af1b8