Do not duplicate the compilation pipeline for stub compilation.

src/code-stubs-hydrogen.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 17 matching lines @@
 #include "v8.h"
 
 #include "code-stubs.h"
 #include "hydrogen.h"
 #include "lithium.h"
 
 namespace v8 {
 namespace internal {
 
 
-Handle<Code> HydrogenCodeStub::CodeFromGraph(HGraph* graph) {
-  graph->OrderBlocks();
-  graph->AssignDominators();
-  graph->CollectPhis();
-  graph->InsertRepresentationChanges();
-  graph->EliminateRedundantBoundsChecks();
+// TODO(svenpanne) Merge with OptimizingCompiler::OptimizeGraph().
+static LChunk* OptimizeGraph(HGraph* graph) {
+  AssertNoAllocation no_gc;
+  NoHandleAllocation no_handles;
+  NoHandleDereference no_deref;
+
+  ASSERT(graph != NULL);
+  SmartArrayPointer<char> bailout_reason;
+  if (!graph->Optimize(&bailout_reason)) {
+    FATAL(bailout_reason.is_empty() ? "unknown" : *bailout_reason);
+  }
   LChunk* chunk = LChunk::NewChunk(graph);
-  ASSERT(chunk != NULL);
-  Handle<Code> stub = chunk->Codegen(Code::COMPILED_STUB);
-  return stub;
+  if (chunk == NULL) {
+    FATAL(graph->info()->bailout_reason());
+  }
+  return chunk;
 }
 
 
 class CodeStubGraphBuilderBase : public HGraphBuilder {
  public:
   CodeStubGraphBuilderBase(Isolate* isolate, HydrogenCodeStub* stub)
       : HGraphBuilder(&info_), info_(stub, isolate), context_(NULL) {}
   virtual bool BuildGraph();
 
  protected:
@@ skipping 68 matching lines @@
       casted_stub()->is_js_array(), casted_stub()->elements_kind(), false);
   AddInstruction(load);
 
   HReturn* ret = new(zone) HReturn(load, context());
   current_block()->Finish(ret);
 }
 
 
 Handle<Code> KeyedLoadFastElementStub::GenerateCode() {
   CodeStubGraphBuilder<KeyedLoadFastElementStub> builder(this);
-  return CodeFromGraph(builder.CreateGraph());
+  LChunk* chunk = OptimizeGraph(builder.CreateGraph());
+  return chunk->Codegen(Code::COMPILED_STUB);
 }
 
 
 } }  // namespace v8::internal