[interpreter] Make it possible to optimize without parse.

src/compiler.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/compiler.h"
 
 #include <algorithm>
 
 #include "src/ast/ast-numbering.h"
 #include "src/ast/prettyprinter.h"
@@ skipping 261 matching lines @@
 
 
 void CompilationInfo::LogDeoptCallPosition(int pc_offset, int inlining_id) {
   if (!track_positions_ || IsStub()) return;
   DCHECK_LT(static_cast<size_t>(inlining_id), inlined_function_infos_.size());
   inlined_function_infos_.at(inlining_id).deopt_pc_offsets.push_back(pc_offset);
 }
 
 
 base::SmartArrayPointer<char> CompilationInfo::GetDebugName() const {
-  if (parse_info()) {
+  if (parse_info() && parse_info()->literal()) {
     AllowHandleDereference allow_deref;
     return parse_info()->literal()->debug_name()->ToCString();
   }
+  if (parse_info() && !parse_info()->shared_info().is_null()) {
+    return parse_info()->shared_info()->DebugName()->ToCString();
+  }
   const char* str = debug_name_ ? debug_name_ : "unknown";
   size_t len = strlen(str) + 1;
   base::SmartArrayPointer<char> name(new char[len]);
   memcpy(name.get(), str, len);
   return name;
 }
 
 
 bool CompilationInfo::ExpectsJSReceiverAsReceiver() {
   return is_sloppy(language_mode()) && !is_native();
@@ skipping 1569 matching lines @@
 }
 
 #if DEBUG
 void CompilationInfo::PrintAstForTesting() {
   PrintF("--- Source from AST ---\n%s\n",
          PrettyPrinter(isolate()).PrintProgram(literal()));
 }
 #endif
 }  // namespace internal
 }  // namespace v8