[clang-tools-extra] [include-cleaner] Support Objective-C literals and boxed expressions in WalkAST (PR #216201)

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``````````bash
git-clang-format --diff origin/main HEAD --extensions cpp -- clang-tools-extra/include-cleaner/lib/WalkAST.cpp clang-tools-extra/include-cleaner/unittests/WalkASTTest.cpp --diff_from_common_commit
``````````

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View the diff from clang-format here.
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``````````diff
diff --git a/clang-tools-extra/include-cleaner/unittests/WalkASTTest.cpp b/clang-tools-extra/include-cleaner/unittests/WalkASTTest.cpp
index bcc1df3f6..742a74aae 100644
--- a/clang-tools-extra/include-cleaner/unittests/WalkASTTest.cpp
+++ b/clang-tools-extra/include-cleaner/unittests/WalkASTTest.cpp
@@ -1250,7 +1250,6 @@ TEST(WalkAST, ObjCTollFreeBridgeCStyleCast) {
            {"-x", "objective-c"});
 }
 
-
 TEST(WalkAST, ObjCBridgedCastExprToProtocol) {
   // Note this test case is handled by TraverseObjCProtocolLoc instead of
   // VisitCastExpr.

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https://github.com/llvm/llvm-project/pull/216201