[clang-tools-extra] [include-cleaner] Fix a race issue when editing multiple files. (PR #76960)

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<!--LLVM CODE FORMAT COMMENT: {clang-format}-->


:warning: C/C++ code formatter, clang-format found issues in your code. :warning:

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``````````bash
git-clang-format --diff e9af57dfea1637a3872052b317c9fe6c71b8d290 6cc7141f1f182763ccec8a4801d3b866cc839324 -- clang-tools-extra/include-cleaner/tool/IncludeCleaner.cpp
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View the diff from clang-format here.
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``````````diff
diff --git a/clang-tools-extra/include-cleaner/tool/IncludeCleaner.cpp b/clang-tools-extra/include-cleaner/tool/IncludeCleaner.cpp
index eacdfab57b..9b22ad4924 100644
--- a/clang-tools-extra/include-cleaner/tool/IncludeCleaner.cpp
+++ b/clang-tools-extra/include-cleaner/tool/IncludeCleaner.cpp
@@ -119,7 +119,7 @@ private:
   RecordedPP PP;
   PragmaIncludes PI;
   llvm::function_ref<bool(llvm::StringRef)> HeaderFilter;
-  llvm::StringMap<std::string>& EditFiles;
+  llvm::StringMap<std::string> &EditFiles;
 
   bool BeginInvocation(CompilerInstance &CI) override {
     // We only perform include-cleaner analysis. So we disable diagnostics that

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https://github.com/llvm/llvm-project/pull/76960