Subzero: Use C++11 member initializers where practical.

src/IceCfg.h

 //===- subzero/src/IceCfg.h - Control flow graph ----------------*- C++ -*-===//
 //
 //                        The Subzero Code Generator
 //
 // This file is distributed under the University of Illinois Open Source
 // License. See LICENSE.TXT for details.
 //
 //===----------------------------------------------------------------------===//
 //
 // This file declares the Cfg class, which represents the control flow
@@ skipping 189 matching lines @@
   void addCallToProfileSummary();
 
   // Iterates over the basic blocks in this CFG, adding profiling code to each
   // one of them. It returns a list with all the globals that the profiling code
   // needs to be defined.
   void profileBlocks();
 
   GlobalContext *Ctx;
   uint32_t SequenceNumber; // output order for emission
   VerboseMask VMask;
-  IceString FunctionName;
-  Type ReturnType;
-  bool IsInternalLinkage;
-  bool HasError;
-  bool FocusedTiming;
-  IceString ErrorMessage;
-  CfgNode *Entry; // entry basic block
-  NodeList Nodes; // linearized node list; Entry should be first
+  IceString FunctionName = "";
+  Type ReturnType = IceType_void;
+  bool IsInternalLinkage = false;
+  bool HasError = false;
+  bool FocusedTiming = false;
+  IceString ErrorMessage = "";
+  CfgNode *Entry = nullptr; // entry basic block
+  NodeList Nodes;           // linearized node list; Entry should be first
   std::vector<IceString> IdentifierNames;
   InstNumberT NextInstNumber;
   VarList Variables;
   VarList Args;         // subset of Variables, in argument order
   VarList ImplicitArgs; // subset of Variables
   std::unique_ptr<ArenaAllocator<>> Allocator;
   std::unique_ptr<Liveness> Live;
   std::unique_ptr<TargetLowering> Target;
   std::unique_ptr<VariablesMetadata> VMetadata;
   std::unique_ptr<Assembler> TargetAssembler;
   // Globals required by this CFG. Mostly used for the profiler's globals.
   std::unique_ptr<VariableDeclarationList> GlobalInits;
 
   // CurrentNode is maintained during dumping/emitting just for
   // validating Variable::DefNode.  Normally, a traversal over
   // CfgNodes maintains this, but before global operations like
   // register allocation, resetCurrentNode() should be called to avoid
   // spurious validation failures.
-  const CfgNode *CurrentNode;
+  const CfgNode *CurrentNode = nullptr;
 
   // Maintain a pointer in TLS to the current Cfg being translated.
   // This is primarily for accessing its allocator statelessly, but
   // other uses are possible.
   ICE_TLS_DECLARE_FIELD(const Cfg *, CurrentCfg);
 
 public:
   static void TlsInit() { ICE_TLS_INIT_FIELD(CurrentCfg); }
 };
 
 } // end of namespace Ice
 
 #endif // SUBZERO_SRC_ICECFG_H