Extract hardcoded error strings into a single place and replace them with enum.

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 23 matching lines @@
 namespace v8 {
 namespace internal {
 
 
 static LChunk* OptimizeGraph(HGraph* graph) {
   DisallowHeapAllocation no_allocation;
   DisallowHandleAllocation no_handles;
   DisallowHandleDereference no_deref;
 
   ASSERT(graph != NULL);
-  SmartArrayPointer<char> bailout_reason;
+  BailoutReason bailout_reason = kNoReason;
   if (!graph->Optimize(&bailout_reason)) {
-    FATAL(bailout_reason.is_empty() ? "unknown" : *bailout_reason);
+    FATAL(GetBailoutReason(bailout_reason));
   }
   LChunk* chunk = LChunk::NewChunk(graph);
   if (chunk == NULL) {
-    FATAL(graph->info()->bailout_reason());
+    FATAL(GetBailoutReason(graph->info()->bailout_reason()));
   }
   return chunk;
 }
 
 
 class CodeStubGraphBuilderBase : public HGraphBuilder {
  public:
   CodeStubGraphBuilderBase(Isolate* isolate, HydrogenCodeStub* stub)
       : HGraphBuilder(&info_),
         arguments_length_(NULL),
@@ skipping 874 matching lines @@
   return value;
 }
 
 
 Handle<Code> ElementsTransitionAndStoreStub::GenerateCode() {
   return DoGenerateCode(this);
 }
 
 
 } }  // namespace v8::internal