Initial fastmem support

* PCSX2 fastmem depression

* Move away from PCSX2 fastmem

* Add enum_flag_ops.hpp

* Finally building on Windows

* Almost got a PoC

* Fix arm64 builds

* This somehow works

* This also works...

* Properly fix fastmem

* Add free region manager

* Update boost

* Add ScopeExit

* Comment out asserts on Linux/Mac/Android

* Comment out ASSERT_MSG asserts too

* Fix derp

* Attempt to fix Android

* Disable fastmem on Android

* Fix Android again maybe pt 2

* android pls

* AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA

* AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA

* Update host_memory.cpp

* Properly reset memory arena on reset

* Proper ashmem code for Android

* more

* Add temporary Android buildjet script for faster prototype builds

* Fix fastmem (again)

* Clean up shared memory

third_party/host_memory/virtual_buffer.cpp

@@ -0,0 +1,47 @@
+// SPDX-FileCopyrightText: Copyright 2020 yuzu Emulator Project
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#ifdef _WIN32
+#include <windows.h>
+#else
+#include <sys/mman.h>
+#endif
+
+#include "host_memory/virtual_buffer.h"
+
+namespace Common {
+
+void* AllocateMemoryPages(std::size_t size) noexcept {
+#ifdef _WIN32
+    void* base{VirtualAlloc(nullptr, size, MEM_COMMIT, PAGE_READWRITE)};
+#else
+    void* base{mmap(nullptr, size, PROT_READ | PROT_WRITE, MAP_ANON | MAP_PRIVATE, -1, 0)};
+
+    if (base == MAP_FAILED) {
+        base = nullptr;
+    }
+#endif
+
+    if (!base) {
+		Helpers::panic("Failed to allocate memory pages");
+    }
+
+    return base;
+}
+
+void FreeMemoryPages(void* base, [[maybe_unused]] std::size_t size) noexcept {
+    if (!base) {
+        return;
+    }
+#ifdef _WIN32
+	if (!VirtualFree(base, 0, MEM_RELEASE)) {
+		Helpers::panic("Failed to free memory pages");
+	}
+#else
+	if (munmap(base, size) != 0) {
+		Helpers::panic("Failed to free memory pages");
+    }
+#endif
+}
+
+} // namespace Common