Fix FLAG_code_comments crash for WASM functions

src/compiler/code-generator.cc

Index: src/compiler/code-generator.cc
diff --git a/src/compiler/code-generator.cc b/src/compiler/code-generator.cc
index ce5ce1e2e9d581e3c7855ee4f38ef99cac41fe4e..701130c7829769baf10d9abc63f45f5f00d647e1 100644
--- a/src/compiler/code-generator.cc
+++ b/src/compiler/code-generator.cc
@@ -401,8 +401,9 @@ void CodeGenerator::AssembleSourcePosition(Instruction* instr) {
   masm()->positions_recorder()->RecordPosition(code_pos);
   masm()->positions_recorder()->WriteRecordedPositions();
   if (FLAG_code_comments) {
-    Vector<char> buffer = Vector<char>::New(256);
     CompilationInfo* info = this->info();
+    if (!info->parse_info()) return;
+    Vector<char> buffer = Vector<char>::New(256);
     int ln = Script::GetLineNumber(info->script(), code_pos);
     int cn = Script::GetColumnNumber(info->script(), code_pos);
     if (info->script()->name()->IsString()) {