================
@@ -623,6 +623,10 @@ class LangOptions : public LangOptionsBase {
   // WebAssembly target.
   bool NoWasmOpt = false;
 
+  /// The default atomic codegen options specified by command line in the
+  /// format of key:{on|off}.
+  std::vector<std::string> AtomicOptionsAsWritten;
----------------
yxsamliu wrote:

The option value is comma separated key/value pairs delimited by colon whereas 
the value could be on/off/true/false/yes/no/0/1. Currently the marshaling 
mechanism of clang option tablegen does not support that. That's why it has to 
be marshaled through MarshallingInfoStringVector. As a result, it needs to be 
represented as  std::vector<std::string> and parsed manually.

https://github.com/llvm/llvm-project/pull/114841
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