Index: clang/lib/Analysis/CFG.cpp
===================================================================
--- clang/lib/Analysis/CFG.cpp
+++ clang/lib/Analysis/CFG.cpp
@@ -4153,7 +4153,7 @@
   //   operand. [...]
   // We add only potentially evaluated statements to the block to avoid
   // CFG generation for unevaluated operands.
-  if (S && !S->isTypeDependent() && S->isPotentiallyEvaluated())
+  if (!S->isTypeDependent() && S->isPotentiallyEvaluated())
     return VisitChildren(S);
 
   // Return block without CFG for unevaluated operands.
Index: clang/lib/CodeGen/CGObjCGNU.cpp
===================================================================
--- clang/lib/CodeGen/CGObjCGNU.cpp
+++ clang/lib/CodeGen/CGObjCGNU.cpp
@@ -46,17 +46,13 @@
 /// types and the function declaration into a module if they're not used, and
 /// avoids constructing the type more than once if it's used more than once.
 class LazyRuntimeFunction {
-  CodeGenModule *CGM;
-  llvm::FunctionType *FTy;
-  const char *FunctionName;
-  llvm::FunctionCallee Function;
+  CodeGenModule *CGM = nullptr;
+  llvm::FunctionType *FTy = nullptr;
+  const char *FunctionName = nullptr;
+  llvm::FunctionCallee Function = nullptr;
 
 public:
-  /// Constructor leaves this class uninitialized, because it is intended to
-  /// be used as a field in another class and not all of the types that are
-  /// used as arguments will necessarily be available at construction time.
-  LazyRuntimeFunction()
-      : CGM(nullptr), FunctionName(nullptr), Function(nullptr) {}
+  LazyRuntimeFunction() = default;
 
   /// Initialises the lazy function with the name, return type, and the types
   /// of the arguments.
Index: clang/lib/Format/UnwrappedLineParser.h
===================================================================
--- clang/lib/Format/UnwrappedLineParser.h
+++ clang/lib/Format/UnwrappedLineParser.h
@@ -306,7 +306,7 @@
   // Since the next token might already be in a new unwrapped line, we need to
   // store the comments belonging to that token.
   SmallVector<FormatToken *, 1> CommentsBeforeNextToken;
-  FormatToken *FormatTok;
+  FormatToken *FormatTok = nullptr;
   bool MustBreakBeforeNextToken;
 
   // The parsed lines. Only added to through \c CurrentLines.
Index: clang/lib/Lex/PPExpressions.cpp
===================================================================
--- clang/lib/Lex/PPExpressions.cpp
+++ clang/lib/Lex/PPExpressions.cpp
@@ -44,7 +44,7 @@
 /// conditional and the source range covered by it.
 class PPValue {
   SourceRange Range;
-  IdentifierInfo *II;
+  IdentifierInfo *II = nullptr;
 
 public:
   llvm::APSInt Val;
Index: clang/lib/StaticAnalyzer/Checkers/CStringChecker.cpp
===================================================================
--- clang/lib/StaticAnalyzer/Checkers/CStringChecker.cpp
+++ clang/lib/StaticAnalyzer/Checkers/CStringChecker.cpp
@@ -96,7 +96,7 @@
   mutable std::unique_ptr<BugType> BT_Null, BT_Bounds, BT_Overlap,
       BT_NotCString, BT_AdditionOverflow, BT_UninitRead;
 
-  mutable const char *CurrentFunctionDescription;
+  mutable const char *CurrentFunctionDescription = nullptr;
 
 public:
   /// The filter is used to filter out the diagnostics which are not enabled by