[clang] [clang][ScanDeps] Canonicalize -D and -U flags (PR #82298)

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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 61ae7e498253d72422cef853798fc2bee1c731cf c89bcfd061066433c90b854ebb0bc369268797ee -- clang/include/clang/Tooling/DependencyScanning/DependencyScanningService.h clang/lib/Tooling/DependencyScanning/DependencyScanningWorker.cpp clang/tools/clang-scan-deps/ClangScanDeps.cpp
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View the diff from clang-format here.
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``````````diff
diff --git a/clang/lib/Tooling/DependencyScanning/DependencyScanningWorker.cpp b/clang/lib/Tooling/DependencyScanning/DependencyScanningWorker.cpp
index 2e2ad5c037..80a01cacee 100644
--- a/clang/lib/Tooling/DependencyScanning/DependencyScanningWorker.cpp
+++ b/clang/lib/Tooling/DependencyScanning/DependencyScanningWorker.cpp
@@ -231,9 +231,9 @@ static void canonicalizeDefines(PreprocessorOptions &PPOpts) {
     return A.first < B.first;
   });
   // Keep the last instance of each macro name by going in reverse
-  auto NewEnd = std::unique(SimpleNames.rbegin(), SimpleNames.rend(), [](const MacroOpt &A, const MacroOpt &B) {
-    return A.first == B.first;
-  });
+  auto NewEnd = std::unique(
+      SimpleNames.rbegin(), SimpleNames.rend(),
+      [](const MacroOpt &A, const MacroOpt &B) { return A.first == B.first; });
   SimpleNames.erase(SimpleNames.begin(), NewEnd.base());
 
   // Apply permutation.

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https://github.com/llvm/llvm-project/pull/82298