[clang] [WebKit checkers] Treat function pointers with "Singleton" suffix as singleton. (PR #158012)

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


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<details>
<summary>
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``````````bash
git-clang-format --diff origin/main HEAD --extensions h,cpp -- clang/lib/StaticAnalyzer/Checkers/WebKit/ASTUtils.cpp clang/lib/StaticAnalyzer/Checkers/WebKit/PtrTypesSemantics.cpp clang/lib/StaticAnalyzer/Checkers/WebKit/PtrTypesSemantics.h
``````````

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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/lib/StaticAnalyzer/Checkers/WebKit/ASTUtils.cpp b/clang/lib/StaticAnalyzer/Checkers/WebKit/ASTUtils.cpp
index e86a1b98f..0d030a95a 100644
--- a/clang/lib/StaticAnalyzer/Checkers/WebKit/ASTUtils.cpp
+++ b/clang/lib/StaticAnalyzer/Checkers/WebKit/ASTUtils.cpp
@@ -153,7 +153,7 @@ bool tryToFindPtrOrigin(
         if (Name == "__builtin___CFStringMakeConstantString" ||
             Name == "NSClassFromString")
           return callback(E, true);
-      } else if (auto* CalleeE = call->getCallee()) {
+      } else if (auto *CalleeE = call->getCallee()) {
         if (auto *E = dyn_cast<DeclRefExpr>(CalleeE->IgnoreParenCasts())) {
           if (isSingleton(E->getFoundDecl()))
             return callback(E, true);

``````````

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https://github.com/llvm/llvm-project/pull/158012