Fix FLAG_code_comments crash for WASM functions

src/compiler/code-generator.cc

 // Copyright 2013 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/compiler/code-generator.h"
 
 #include "src/address-map.h"
 #include "src/compiler/code-generator-impl.h"
 #include "src/compiler/linkage.h"
 #include "src/compiler/pipeline.h"
@@ skipping 383 matching lines @@
 void CodeGenerator::AssembleSourcePosition(Instruction* instr) {
   SourcePosition source_position;
   if (!code()->GetSourcePosition(instr, &source_position)) return;
   if (source_position == current_source_position_) return;
   current_source_position_ = source_position;
   if (source_position.IsUnknown()) return;
   int code_pos = source_position.raw();
   masm()->positions_recorder()->RecordPosition(code_pos);
   masm()->positions_recorder()->WriteRecordedPositions();
   if (FLAG_code_comments) {
+    CompilationInfo* info = this->info();
+    if (!info->parse_info()) return;
     Vector<char> buffer = Vector<char>::New(256);
-    CompilationInfo* info = this->info();
     int ln = Script::GetLineNumber(info->script(), code_pos);
     int cn = Script::GetColumnNumber(info->script(), code_pos);
     if (info->script()->name()->IsString()) {
       Handle<String> file(String::cast(info->script()->name()));
       base::OS::SNPrintF(buffer.start(), buffer.length(), "-- %s:%d:%d --",
                          file->ToCString().get(), ln, cn);
     } else {
       base::OS::SNPrintF(buffer.start(), buffer.length(),
                          "-- <unknown>:%d:%d --", ln, cn);
     }
@@ skipping 399 matching lines @@
     : frame_(gen->frame()), masm_(gen->masm()), next_(gen->ools_) {
   gen->ools_ = this;
 }
 
 
 OutOfLineCode::~OutOfLineCode() {}
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8