[clang] [clang][MBD] set up module build daemon infrastructure (PR #67562)

[Connor Sughrue via cfe-commits]

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@@ -3738,6 +3737,19 @@ static bool RenderModulesOptions(Compilation &C, const Driver &D,
        Std->containsValue("c++latest") || Std->containsValue("gnu++latest"));
   bool HaveModules = HaveStdCXXModules;
 
+  // -fmodule-build-daemon enables module build daemon functionality
+  if (Args.hasArg(options::OPT_fmodule_build_daemon))
+    Args.AddLastArg(CmdArgs, options::OPT_fmodule_build_daemon);
+
+  // by default module build daemon socket address and output files are saved
+  // under /tmp/ but that can be overridden by providing the
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cpsughrue wrote:

The `/tmp` is provided by `llvm::sys::path::system_temp_directory` which is portable

https://github.com/llvm/llvm-project/pull/67562