Capture a 64-bit process trying to jump to 32-bit syscall handler

Fixes #591

Adds a simple unittest

FEXCore/Source/Interface/Core/OpcodeDispatcher.cpp

@@ -5218,6 +5218,9 @@ void OpDispatchBuilder::INTOp(OpcodeArgs) {
     constexpr uint8_t SYSCALL_LITERAL = 0x2E;
 #endif
     if (Literal == SYSCALL_LITERAL) {
+      if (CTX->Config.Is64BitMode()) [[unlikely]] {
+        ERROR_AND_DIE_FMT("[Unsupported] Trying to execute 32-bit syscall from a 64-bit process.");
+      }
       // Syscall on linux
       SyscallOp<false>(Op);
       return;