[CodeCompletion] Add '-warn-concurrency' to swift-ide-test

(cherry picked from commit 7a3f7c6)

Author: rintaro

tools/swift-ide-test/swift-ide-test.cpp

@@ -757,6 +757,10 @@ static llvm::cl::opt<bool>
 EnableExperimentalConcurrency("enable-experimental-concurrency",
                               llvm::cl::desc("Enable experimental concurrency model"),
                               llvm::cl::init(false));
+static llvm::cl::opt<bool>
+WarnConcurrency("warn-concurrency",
+                llvm::cl::desc("Additional concurrency warnings"),
+                llvm::cl::init(false));
 
 static llvm::cl::opt<bool>
 DisableImplicitConcurrencyImport("disable-implicit-concurrency-module-import",
@@ -3853,6 +3857,9 @@ int main(int argc, char *argv[]) {
   if (options::EnableExperimentalConcurrency) {
     InitInvok.getLangOptions().EnableExperimentalConcurrency = true;
   }
+  if (options::WarnConcurrency) {
+    InitInvok.getLangOptions().WarnConcurrency = true;
+  }
   if (options::DisableImplicitConcurrencyImport) {
     InitInvok.getLangOptions().DisableImplicitConcurrencyModuleImport = true;
   }