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

src/compiler/code-assembler.h

Index: src/compiler/code-assembler.h
diff --git a/src/compiler/code-assembler.h b/src/compiler/code-assembler.h
index bce758f1c9e20491a172b04deb35b261fb130c40..db02c30b65277842aee6e764caf3e9c45a43f869 100644
--- a/src/compiler/code-assembler.h
+++ b/src/compiler/code-assembler.h
@@ -455,6 +455,8 @@ class V8_EXPORT_PRIVATE CodeAssembler {
 
   CodeAssemblerState* state() { return state_; }
 
+  void BreakOnNode(int node_id);
+
  protected:
   // Enables subclasses to perform operations before and after a call.
   virtual void CallPrologue();
@@ -464,6 +466,8 @@ class V8_EXPORT_PRIVATE CodeAssembler {
   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_;
@@ -546,6 +550,8 @@ class V8_EXPORT_PRIVATE CodeAssemblerState {
 
   ~CodeAssemblerState();
 
+  const char* name() const { return name_; }
+
  private:
   friend class CodeAssembler;
   friend class CodeAssemblerLabel;