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

[Alex Hoppen via cfe-commits]

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@@ -681,12 +957,22 @@ renameOutsideFile(const NamedDecl &RenameDecl, llvm::StringRef MainFilePath,
            ExpBuffer.getError().message());
       continue;
     }
+    std::string RenameIdentifier = RenameDecl.getNameAsString();
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ahoppen wrote:

Technically `RenameIdentifier` isn’t correct here because this can be an Objective-C selector name, right? Which would be multiple identifiers and colons.

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