[clang] Add a missing space to the -Weager-load-cxx-named-modules diagnostic message. (#131987)

Author: hokein

clang/include/clang/Basic/DiagnosticFrontendKinds.td

@@ -266,7 +266,7 @@ def err_test_module_file_extension_version : Error<
   "(%3.%4)">;
 
 def warn_eagerly_load_for_standard_cplusplus_modules : Warning<
-  "the form '-fmodule-file=<BMI-path>' is deprecated for standard C++ named modules;"
+  "the form '-fmodule-file=<BMI-path>' is deprecated for standard C++ named modules; "
   "consider to use '-fmodule-file=<module-name>=<BMI-path>' instead">,
   InGroup<DiagGroup<"eager-load-cxx-named-modules">>;
 

clang/test/Modules/eagerly-load-cxx-named-modules.cppm

@@ -22,4 +22,4 @@ import a;
 //--- user.cpp
 import a;
 
-// CHECK: the form '-fmodule-file=<BMI-path>' is deprecated for standard C++ named modules;consider to use '-fmodule-file=<module-name>=<BMI-path>' instead
+// CHECK: the form '-fmodule-file=<BMI-path>' is deprecated for standard C++ named modules; consider to use '-fmodule-file=<module-name>=<BMI-path>' instead