[turbofan] Added --csa-trap-on-node option that helps debugging graph verification issues.

src/compiler/code-assembler.h

 // Copyright 2015 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef V8_COMPILER_CODE_ASSEMBLER_H_
 #define V8_COMPILER_CODE_ASSEMBLER_H_
 
 #include <map>
 #include <memory>
 
@@ skipping 437 matching lines @@
   void GotoIfException(Node* node, Label* if_exception,
                        Variable* exception_var = nullptr);
 
   // Helpers which delegate to RawMachineAssembler.
   Factory* factory() const;
   Isolate* isolate() const;
   Zone* zone() const;
 
   CodeAssemblerState* state() { return state_; }
 
+  void BreakOnNode(int node_id);
+
  protected:
   // Enables subclasses to perform operations before and after a call.
   virtual void CallPrologue();
   virtual void CallEpilogue();
 
  private:
   Node* CallN(CallDescriptor* descriptor, Node* code_target, Node** args);
   Node* TailCallN(CallDescriptor* descriptor, Node* code_target, Node** args);
 
+  void InstallBreakOnNodeDecorator();
+
   RawMachineAssembler* raw_assembler() const;
 
   CodeAssemblerState* state_;
 
   DISALLOW_COPY_AND_ASSIGN(CodeAssembler);
 };
 
 class CodeAssemblerVariable {
  public:
   explicit CodeAssemblerVariable(CodeAssembler* assembler,
@@ skipping 62 matching lines @@
                      const CallInterfaceDescriptor& descriptor,
                      Code::Flags flags, const char* name,
                      size_t result_size = 1);
 
   // Create with JSCall linkage.
   CodeAssemblerState(Isolate* isolate, Zone* zone, int parameter_count,
                      Code::Flags flags, const char* name);
 
   ~CodeAssemblerState();
 
+  const char* name() const { return name_; }
+
  private:
   friend class CodeAssembler;
   friend class CodeAssemblerLabel;
   friend class CodeAssemblerVariable;
 
   CodeAssemblerState(Isolate* isolate, Zone* zone,
                      CallDescriptor* call_descriptor, Code::Flags flags,
                      const char* name);
 
   std::unique_ptr<RawMachineAssembler> raw_assembler_;
   Code::Flags flags_;
   const char* name_;
   bool code_generated_;
   ZoneSet<CodeAssemblerVariable::Impl*> variables_;
 
   DISALLOW_COPY_AND_ASSIGN(CodeAssemblerState);
 };
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_COMPILER_CODE_ASSEMBLER_H_