[clang-tools-extra] Add support for renaming objc methods, even those with multiple selector pieces (PR #76466)

[kadir çetinkaya via cfe-commits]

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@@ -53,13 +55,38 @@ struct RenameInputs {
 struct RenameResult {
   // The range of the symbol that the user can attempt to rename.
   Range Target;
+  // Placeholder text for the rename operation, if set.
+  std::optional<std::string> Placeholder;
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kadircet wrote:

same here, let's drop optional

https://github.com/llvm/llvm-project/pull/76466