[Interpreter] Rebuild dispatch table when FLAG_trace_ignition_codegen is enabled.

src/interpreter/interpreter.cc

 // 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.
 
 #include "src/interpreter/interpreter.h"
 
 #include "src/ast/prettyprinter.h"
 #include "src/code-factory.h"
 #include "src/compiler.h"
 #include "src/factory.h"
@@ skipping 93 matching lines @@
     bytecodes->Print(os);
     os << std::flush;
   }
 
   info->SetBytecodeArray(bytecodes);
   info->SetCode(info->isolate()->builtins()->InterpreterEntryTrampoline());
   return true;
 }
 
 bool Interpreter::IsDispatchTableInitialized() {
-  if (FLAG_trace_ignition) {
-    // Regenerate table to add bytecode tracing operations.
+  if (FLAG_trace_ignition || FLAG_trace_ignition_codegen) {
+    // Regenerate table to add bytecode tracing operations
+    // or to print the assembly code generated by TurboFan.
     return false;
   }
   return dispatch_table_[0] != nullptr;
 }
 
 void Interpreter::TraceCodegen(Handle<Code> code) {
 #ifdef ENABLE_DISASSEMBLER
   if (FLAG_trace_ignition_codegen) {
     OFStream os(stdout);
     code->Disassemble(nullptr, os);
@@ skipping 1796 matching lines @@
   Node* index = __ LoadRegister(index_reg);
   Node* one = __ SmiConstant(Smi::FromInt(1));
   Node* result = __ SmiAdd(index, one);
   __ SetAccumulator(result);
   __ Dispatch();
 }
 
 }  // namespace interpreter
 }  // namespace internal
 }  // namespace v8