[clang] [llvm] Add RunTimeLang to Class and Enumeration DIBuilder functions (PR #72011)

[Felipe de Azevedo Piovezan via cfe-commits]

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@@ -424,6 +424,7 @@ namespace llvm {
     /// \param OffsetInBits Member offset.
     /// \param Flags        Flags to encode member attribute, e.g. private
     /// \param Elements     class members.
+    /// \param RunTimeLang  Optional parameter, Objective-C runtime version.
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felipepiovezan wrote:

let's use an `optional` type to denote an optional value

https://github.com/llvm/llvm-project/pull/72011
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