[dynarmic/tests] fix dynarmic_test_generator link error

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

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

@@ -152,7 +152,9 @@ struct Jit::Impl final {
     }
 
     std::string Disassemble() const {
-        UNREACHABLE();
+        const size_t size = reinterpret_cast<const char*>(block_of_code.getCurr()) - reinterpret_cast<const char*>(block_of_code.GetCodeBegin());
+        auto const* p = reinterpret_cast<const char*>(block_of_code.GetCodeBegin());
+        return Common::DisassembleX64(p, p + size);
     }
 
 private:

src/dynarmic/src/dynarmic/backend/x64/a32_interface.cpp

@@ -323,4 +323,8 @@ void Jit::ClearExclusiveState() {
     impl->ClearExclusiveState();
 }
 
+std::string Jit::Disassemble() const {
+    return impl->Disassemble();
+}
+
 }  // namespace Dynarmic::A32