[clang] [llvm] [clang] Add `-verify-directives` cc1 flag (PR #179835)

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<summary>
You can test this locally with the following command:
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``````````bash
git-clang-format --diff origin/main HEAD --extensions cpp,h -- clang/test/Frontend/verify-directives-full-match.cpp clang/test/Frontend/verify-directives-one-diag.cpp clang/test/Frontend/verify-directives-order.cpp clang/test/Frontend/verify-directives-wildcard.cpp clang/include/clang/Frontend/TextDiagnosticBuffer.h clang/include/clang/Frontend/VerifyDiagnosticConsumer.h clang/lib/Frontend/CompilerInvocation.cpp clang/lib/Frontend/VerifyDiagnosticConsumer.cpp --diff_from_common_commit
``````````

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The reproduction instructions above might return results for more than one PR
in a stack if you are using a stacked PR workflow. You can limit the results by
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/lib/Frontend/VerifyDiagnosticConsumer.cpp b/clang/lib/Frontend/VerifyDiagnosticConsumer.cpp
index 99f618e45..745cb92ec 100644
--- a/clang/lib/Frontend/VerifyDiagnosticConsumer.cpp
+++ b/clang/lib/Frontend/VerifyDiagnosticConsumer.cpp
@@ -1175,14 +1175,14 @@ static unsigned CheckResultsAreInOrder(DiagnosticsEngine &Diags,
     std::vector<const Directive *> OrderedEW(OrderedErrors.size() +
                                              OrderedWarns.size());
     std::merge(OrderedErrors.cbegin(), OrderedErrors.cend(),
-               OrderedWarns.cbegin(), OrderedWarns.cend(),
-               OrderedEW.begin(), directiveComparator);
+               OrderedWarns.cbegin(), OrderedWarns.cend(), OrderedEW.begin(),
+               directiveComparator);
 
     std::vector<const Directive *> OrderedNR(OrderedNotes.size() +
                                              OrderedRemarks.size());
     std::merge(OrderedNotes.cbegin(), OrderedNotes.cend(),
-               OrderedRemarks.cbegin(), OrderedRemarks.cend(), OrderedNR.begin(),
-               directiveComparator);
+               OrderedRemarks.cbegin(), OrderedRemarks.cend(),
+               OrderedNR.begin(), directiveComparator);
 
     std::vector<const Directive *> OrderedDirectives(OrderedEW.size() +
                                                      OrderedNR.size());

``````````

</details>


https://github.com/llvm/llvm-project/pull/179835