[SYCL] Add break statements to avoid unannotated fallthrough (#13068)

Author: againull

sycl/pi_win_proxy_loader/pi_win_proxy_loader.cpp

@@ -224,8 +224,9 @@ BOOL WINAPI DllMain(HINSTANCE hinstDLL, // handle to DLL module
     if (PrintPiTrace)
       std::cout << "---> DLL_PROCESS_DETACH pi_win_proxy_loader.dll\n"
                 << std::endl;
-
+    break;
   case DLL_THREAD_ATTACH:
+    break;
   case DLL_THREAD_DETACH:
     break;
   }

sycl/plugins/common_win_pi_trace/common_win_pi_trace.hpp

@@ -33,7 +33,9 @@ BOOL WINAPI DllMain(HINSTANCE hinstDLL,  // handle to DLL module
     if (PrintPiTrace)
       std::cout << "---> DLL_PROCESS_ATTACH " << __SYCL_PLUGIN_DLL_NAME << "\n"
                 << std::endl;
+    break;
   case DLL_THREAD_ATTACH:
+    break;
   case DLL_THREAD_DETACH:
     break;
   }

sycl/source/detail/global_handler.cpp

@@ -357,7 +357,9 @@ extern "C" __SYCL_EXPORT BOOL WINAPI DllMain(HINSTANCE hinstDLL,
   case DLL_PROCESS_ATTACH:
     if (PrintPiTrace)
       std::cout << "---> DLL_PROCESS_ATTACH syclx.dll\n" << std::endl;
+    break;
   case DLL_THREAD_ATTACH:
+    break;
   case DLL_THREAD_DETACH:
     break;
   }