[clang] [llvm] Introduce a new WebKit checker for a unchecked local variable (PR #113708)

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


:warning: C/C++ code formatter, clang-format found issues in your code. 
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``````````bash
git-clang-format --diff 5c20891b2bb60f82dd82a8e90b111f8c13a13ad4 
cf5ca301bc9ed2c65eed92e7299bf598d5f88103 --extensions cpp,h -- 
clang/test/Analysis/Checkers/WebKit/unchecked-local-vars.cpp 
clang/lib/StaticAnalyzer/Checkers/WebKit/PtrTypesSemantics.cpp 
clang/lib/StaticAnalyzer/Checkers/WebKit/PtrTypesSemantics.h 
clang/test/Analysis/Checkers/WebKit/mock-types.h 
clang/lib/StaticAnalyzer/Checkers/WebKit/RawPtrRefLocalVarsChecker.cpp
``````````

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View the diff from clang-format here.
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``````````diff
diff --git a/clang/lib/StaticAnalyzer/Checkers/WebKit/PtrTypesSemantics.cpp 
b/clang/lib/StaticAnalyzer/Checkers/WebKit/PtrTypesSemantics.cpp
index 5d39d02a2f..46819d5ca1 100644
--- a/clang/lib/StaticAnalyzer/Checkers/WebKit/PtrTypesSemantics.cpp
+++ b/clang/lib/StaticAnalyzer/Checkers/WebKit/PtrTypesSemantics.cpp
@@ -200,8 +200,7 @@ std::optional<bool> isUncountedPtr(const QualType T) {
   return false;
 }
 
-std::optional<bool> isUncheckedPtr(const QualType T)
-{
+std::optional<bool> isUncheckedPtr(const QualType T) {
   if (T->isPointerType() || T->isReferenceType()) {
     if (auto *CXXRD = T->getPointeeCXXRecordDecl())
       return isUnchecked(CXXRD);
diff --git 
a/clang/lib/StaticAnalyzer/Checkers/WebKit/RawPtrRefLocalVarsChecker.cpp 
b/clang/lib/StaticAnalyzer/Checkers/WebKit/RawPtrRefLocalVarsChecker.cpp
index 0842cdbc40..0781471d73 100644
--- a/clang/lib/StaticAnalyzer/Checkers/WebKit/RawPtrRefLocalVarsChecker.cpp
+++ b/clang/lib/StaticAnalyzer/Checkers/WebKit/RawPtrRefLocalVarsChecker.cpp
@@ -109,7 +109,7 @@ class RawPtrRefLocalVarsChecker
   mutable BugReporter *BR;
 
 public:
-  RawPtrRefLocalVarsChecker(const char* description)
+  RawPtrRefLocalVarsChecker(const char *description)
       : Bug(this, description, "WebKit coding guidelines") {}
 
   virtual std::optional<bool> isUnsafePtr(const QualType T) const = 0;

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https://github.com/llvm/llvm-project/pull/113708
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