Add workaround helper for bit_cast and missing #include <bit>

Allows compilation on native macOS build system.

include/helpers.hpp

@@ -152,6 +152,12 @@ namespace Helpers {
     static constexpr inline u8 incBCDByte(u8 value) {
         return ((value & 0xf) == 0x9) ? value + 7 : value + 1;
     }
+    // Use this helper for platforms that lack a working std::bit_cast implementation
+    // TODO: Replace this with C++20 version if available
+    template< class To, class From >
+    constexpr To bit_cast( const From& from ) noexcept{
+        return *reinterpret_cast<const To*>(&from);
+    }
 };
 
 // UDLs for memory size values

src/core/kernel/threads.cpp

@@ -1,3 +1,4 @@
+#include <bit>
 #include <cassert>
 #include <cstring>
 

src/core/services/cfg.cpp

@@ -73,7 +73,7 @@ void CFGService::getConfigInfoBlk2(u32 messagePointer) {
 		};
 
 		for (int i = 0; i < 8; i++) {
-			mem.write32(output + i * 4, std::bit_cast<u32, float>(STEREO_CAMERA_SETTINGS[i]));
+			mem.write32(output + i * 4, Helpers::bit_cast<u32, float>(STEREO_CAMERA_SETTINGS[i]));
 		}
 	} else if (size == 0x1C && blockID == 0xA0000) { // Username
 		writeStringU16(output, u"Pander");

src/core/services/hid.cpp

@@ -83,7 +83,7 @@ void HIDService::getGyroscopeCoefficient(u32 messagePointer) {
 	constexpr float gyroscopeCoeff = 14.375f; // Same as retail 3DS
 	mem.write32(messagePointer, IPC::responseHeader(0x15, 2, 0));
 	mem.write32(messagePointer + 4, Result::Success);
-	mem.write32(messagePointer + 8, std::bit_cast<u32, float>(gyroscopeCoeff));
+	mem.write32(messagePointer + 8, Helpers::bit_cast<u32, float>(gyroscopeCoeff));
 }
 
 void HIDService::getIPCHandles(u32 messagePointer) {