[clang-tools-extra] Use llvm::unique (NFC) (#139663)

clang-tools-extra/clangd/Hover.cpp

@@ -1270,9 +1270,8 @@ void maybeAddUsedSymbols(ParsedAST &AST, HoverInfo &HI, const Inclusion &Inc) {
   for (const auto &UsedSymbolDecl : UsedSymbols)
     HI.UsedSymbolNames.push_back(getSymbolName(UsedSymbolDecl));
   llvm::sort(HI.UsedSymbolNames);
-  HI.UsedSymbolNames.erase(
-      std::unique(HI.UsedSymbolNames.begin(), HI.UsedSymbolNames.end()),
-      HI.UsedSymbolNames.end());
+  HI.UsedSymbolNames.erase(llvm::unique(HI.UsedSymbolNames),
+                           HI.UsedSymbolNames.end());
 }
 
 } // namespace

clang-tools-extra/include-cleaner/lib/HTMLReport.cpp

@@ -186,8 +186,7 @@ class Reporter {
       R.Satisfied = true;
     // Include pointers are meaningfully ordered as they are backed by a vector.
     llvm::sort(R.Includes);
-    R.Includes.erase(std::unique(R.Includes.begin(), R.Includes.end()),
-                     R.Includes.end());
+    R.Includes.erase(llvm::unique(R.Includes), R.Includes.end());
 
     if (!R.Headers.empty())
       R.Insert =

clang-tools-extra/include-cleaner/lib/Record.cpp

@@ -205,9 +205,7 @@ public:
   void EndOfMainFile() override {
     for (auto &It : Out->IWYUExportBy) {
       llvm::sort(It.getSecond());
-      It.getSecond().erase(
-          std::unique(It.getSecond().begin(), It.getSecond().end()),
-          It.getSecond().end());
+      It.getSecond().erase(llvm::unique(It.getSecond()), It.getSecond().end());
     }
     Out->Arena.emplace_back(std::move(Arena));
   }