[clang-tools-extra] [clangd] Share AST traversal in refactoring tweaks (PR #202629)

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``````````bash
git-clang-format --diff origin/main HEAD --extensions cpp -- clang-tools-extra/clangd/refactor/tweaks/AddUsing.cpp clang-tools-extra/clangd/refactor/tweaks/ExtractFunction.cpp clang-tools-extra/clangd/refactor/tweaks/RemoveUsingNamespace.cpp --diff_from_common_commit
``````````

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changing `origin/main` to the base branch/commit you want to compare against.
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View the diff from clang-format here.
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``````````diff
diff --git a/clang-tools-extra/clangd/refactor/tweaks/AddUsing.cpp b/clang-tools-extra/clangd/refactor/tweaks/AddUsing.cpp
index 5e6d66ee2..81cd805f1 100644
--- a/clang-tools-extra/clangd/refactor/tweaks/AddUsing.cpp
+++ b/clang-tools-extra/clangd/refactor/tweaks/AddUsing.cpp
@@ -12,9 +12,9 @@
 #include "refactor/Tweak.h"
 #include "support/Logger.h"
 #include "clang/AST/Decl.h"
+#include "clang/AST/DynamicRecursiveASTVisitor.h"
 #include "clang/AST/Expr.h"
 #include "clang/AST/NestedNameSpecifier.h"
-#include "clang/AST/DynamicRecursiveASTVisitor.h"
 #include "clang/AST/Type.h"
 #include "clang/AST/TypeLoc.h"
 #include "clang/Basic/LLVM.h"
diff --git a/clang-tools-extra/clangd/refactor/tweaks/ExtractFunction.cpp b/clang-tools-extra/clangd/refactor/tweaks/ExtractFunction.cpp
index 3a5e5566c..6534396c8 100644
--- a/clang-tools-extra/clangd/refactor/tweaks/ExtractFunction.cpp
+++ b/clang-tools-extra/clangd/refactor/tweaks/ExtractFunction.cpp
@@ -56,9 +56,9 @@
 #include "clang/AST/ASTContext.h"
 #include "clang/AST/Decl.h"
 #include "clang/AST/DeclBase.h"
+#include "clang/AST/DynamicRecursiveASTVisitor.h"
 #include "clang/AST/ExprCXX.h"
 #include "clang/AST/NestedNameSpecifier.h"
-#include "clang/AST/DynamicRecursiveASTVisitor.h"
 #include "clang/AST/Stmt.h"
 #include "clang/Basic/LangOptions.h"
 #include "clang/Basic/SourceLocation.h"

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https://github.com/llvm/llvm-project/pull/202629