In PrintCode, keep the debug_name string alive for all uses.

src/codegen.cc

 // Copyright 2012 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/v8.h"
 
 #if defined(V8_OS_AIX)
 #include <fenv.h>
 #endif
 #include "src/bootstrapper.h"
@@ skipping 165 matching lines @@
 void CodeGenerator::PrintCode(Handle<Code> code, CompilationInfo* info) {
 #ifdef ENABLE_DISASSEMBLER
   AllowDeferredHandleDereference allow_deference_for_print_code;
   bool print_code = info->isolate()->bootstrapper()->IsActive()
       ? FLAG_print_builtin_code
       : (FLAG_print_code ||
          (info->IsStub() && FLAG_print_code_stubs) ||
          (info->IsOptimizing() && FLAG_print_opt_code));
   if (print_code) {
     const char* debug_name;
+    SmartArrayPointer<char> debug_name_holder;
     if (info->IsStub()) {
       CodeStub::Major major_key = info->code_stub()->MajorKey();
       debug_name = CodeStub::MajorName(major_key, false);
     } else {
-      debug_name =
-          info->parse_info()->function()->debug_name()->ToCString().get();
+      debug_name_holder =
+          info->parse_info()->function()->debug_name()->ToCString();
+      debug_name = debug_name_holder.get();
     }
 
     CodeTracer::Scope tracing_scope(info->isolate()->GetCodeTracer());
     OFStream os(tracing_scope.file());
 
     // Print the source code if available.
     FunctionLiteral* function = nullptr;
     bool print_source =
         info->parse_info() && (code->kind() == Code::OPTIMIZED_FUNCTION ||
                                code->kind() == Code::FUNCTION);
@@ skipping 43 matching lines @@
     masm->positions_recorder()->RecordStatementPosition(pos);
     masm->positions_recorder()->RecordPosition(pos);
     if (right_here) {
       return masm->positions_recorder()->WriteRecordedPositions();
     }
   }
   return false;
 }
 
 } }  // namespace v8::internal