[common] Switch to boost::unordered_flat containers (#4326)

Replaces all instances of ankerl's unordered map/set with boost's
`unordered_flat_*` classes. This uses std::hash since boost::hash is
actually a lot slower.

Also adds an abstraction layer in `Common` so future changes are quicker
and easier.

Other implementation details:
- ankerl provided hash specializations for tuple and pair, so those were
  ported here
- std::erase_if doesn't work on boost, so just used the ADL'd erase_if

This should be about equal or superior performance as unordered_dense for everything except iteration.

Signed-off-by: crueter <crueter@eden-emu.dev>

- [x] I have read and followed the [Contribution Guidelines](https://git.eden-emu.dev/eden-emu/eden/src/branch/master/CONTRIBUTING.md#code-contributions).
- [x] I have read and followed the [AI Policy](https://git.eden-emu.dev/eden-emu/eden/src/branch/master/docs/policies/AI.md)
- [x] I have read and followed the [Coding Guidelines](https://git.eden-emu.dev/eden-emu/eden/src/branch/master/docs/policies/Coding.md) to the best of my ability.

-------------------

Reviewed-on: https://git.eden-emu.dev/eden-emu/eden/pulls/4326
Reviewed-by: Lizzie and Samuel <lizzie@eden-emu.dev>
Reviewed-by: MaranBr <maranbr@eden-emu.dev>

2 files changed, 4 insertions, 4 deletions

diff --git a/src/tests/common/fibers.cpp b/src/tests/common/fibers.cpp
index ce17a5c52c..93f6cd4fdb 100644
--- a/src/tests/common/fibers.cpp
+++ b/src/tests/common/fibers.cpp
@@ -11,7 +11,7 @@
 #include <mutex>
 #include <stdexcept>
 #include <thread>
-#include <ankerl/unordered_dense.h>
+#include "common/container/unordered_map.h"
 #include <vector>
 
 #include <catch2/catch_test_macros.hpp>
@@ -39,7 +39,7 @@ public:
 
 private:
     mutable std::mutex mutex;
-    ankerl::unordered_dense::map<std::thread::id, u32> ids;
+    ::Common::unordered_map<std::thread::id, u32> ids;
 };
 
 class TestControl1 {
diff --git a/src/tests/video_core/memory_tracker.cpp b/src/tests/video_core/memory_tracker.cpp
index 5fd8037446..c2236848b5 100644
--- a/src/tests/video_core/memory_tracker.cpp
+++ b/src/tests/video_core/memory_tracker.cpp
@@ -3,7 +3,7 @@
 
 #include <memory>
 #include <stdexcept>
-#include <ankerl/unordered_dense.h>
+#include "common/container/unordered_map.h"
 #include <tuple>
 #include <vector>
 #include <optional>
@@ -65,7 +65,7 @@ public:
     }
 
 private:
-    ankerl::unordered_dense::map<u64, int> page_table;
+    ::Common::unordered_map<u64, int> page_table;
     std::vector<std::tuple<DAddr, u64, int>> calls;
     size_t update_calls = 0;
 };