[clang] [clang] Move CCC_OVERRIDE_OPTIONS implementation to Driver (PR #85425)

[Fangrui Song via cfe-commits]

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@@ -6677,3 +6678,134 @@ llvm::Error driver::expandResponseFiles(SmallVectorImpl<const char *> &Args,
 
   return llvm::Error::success();
 }
+
+namespace {
+
+const char *GetStableCStr(std::set<std::string> &SavedStrings, StringRef S) {
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MaskRay wrote:

We prefer `static` for functions

https://llvm.org/docs/CodingStandards.html#anonymous-namespaces

https://github.com/llvm/llvm-project/pull/85425