[dynarmic] fix build error for dynarmic_tests_generator on aarch64

src/dynarmic/src/dynarmic/backend/arm64/a32_interface.cpp

@@ -125,6 +125,10 @@ struct Jit::Impl final {
         current_state.exclusive_state = false;
     }
 
+    std::string Disassemble() const {
+        return {};
+    }
+
 private:
     void PerformRequestedCacheInvalidation(HaltReason hr) {
         if (Has(hr, HaltReason::CacheInvalidation)) {
@@ -231,4 +235,8 @@ void Jit::ClearExclusiveState() {
     impl->ClearExclusiveState();
 }
 
+std::string Jit::Disassemble() const {
+    return impl->Disassemble();
+}
+
 }  // namespace Dynarmic::A32

src/dynarmic/src/dynarmic/backend/arm64/a64_interface.cpp

@@ -152,7 +152,7 @@ struct Jit::Impl final {
     }
 
     std::string Disassemble() const {
-        UNREACHABLE();
+        return {};
     }
 
 private: