Merge pull request #5336 from benlangmuir/fix-struct-bind

[stable/20220421] Remove use of structured binding in std=c++14

Author: shahmishal

clang/lib/Frontend/CompilerInvocation.cpp

@@ -2972,7 +2972,8 @@ static bool ParseFrontendArgs(FrontendOptions &Opts, ArgList &Args,
       Opts.ModuleFiles.push_back(std::string(Val));
   }
   for (const Arg *A : Args.filtered(OPT_fmodule_file_cache_key)) {
-    auto [Path, Key] = StringRef(A->getValue()).rsplit('=');
+    StringRef Path, Key;
+    std::tie(Path, Key) = StringRef(A->getValue()).rsplit('=');
     if (Key.empty() || Path.empty()) {
       Diags.Report(diag::err_module_cache_key_spelling);
     } else {