[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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@@ -543,6 +550,45 @@ std::optional<InvalidName> checkName(const NamedDecl &RenameDecl,
   return Result;
 }
 
+clangd::Range tokenRangeForLoc(ParsedAST &AST, SourceLocation TokLoc,
+                               const SourceManager &SM,
+                               const LangOptions &LangOpts) {
+  const auto *Token = AST.getTokens().spelledTokenAt(TokLoc);
+  assert(Token && "got inclusion at wrong offset");
+  clangd::Range Result;
+  Result.start = sourceLocToPosition(SM, Token->location());
+  Result.end = sourceLocToPosition(SM, Token->endLocation());
+  return Result;
+}
+
+// AST-based ObjC method rename, it renames all occurrences in the main file
+// even for selectors which may have multiple tokens.
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kadircet wrote:

can we also define what `Locs` are, with a better name (like `SelectorOccurences`)?

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