[lldb] Pass extra clang args by const-ref (NFC)

Author: kastiglione

lldb/source/Plugins/TypeSystem/Swift/SwiftASTContext.cpp

@@ -1499,7 +1499,7 @@ void SwiftASTContext::AddExtraClangArgs(const std::vector<std::string>& source,
   }
 }
 
-void SwiftASTContext::AddExtraClangArgs(std::vector<std::string> ExtraArgs) {
+void SwiftASTContext::AddExtraClangArgs(const std::vector<std::string> &ExtraArgs) {
   swift::ClangImporterOptions &importer_options = GetClangImporterOptions();
   AddExtraClangArgs(ExtraArgs, importer_options.ExtraArgs);
 }

lldb/source/Plugins/TypeSystem/Swift/SwiftASTContext.h

@@ -242,7 +242,7 @@ class SwiftASTContext : public TypeSystemSwift {
 
   /// Add a list of Clang arguments to the ClangImporter options and
   /// apply the working directory to any relative paths.
-  void AddExtraClangArgs(std::vector<std::string> ExtraArgs);
+  void AddExtraClangArgs(const std::vector<std::string> &ExtraArgs);
   static void AddExtraClangArgs(const std::vector<std::string>& source,
                                 std::vector<std::string>& dest);