Remove unused --peephole-optimization flag.

src/v8.cc

Index: src/v8.cc
diff --git a/src/v8.cc b/src/v8.cc
index 36ee221948dd3a639a609907765fb18e5d5187be..e4b37b180e1f49eefc2601ed93a846769c961c8f 100644
--- a/src/v8.cc
+++ b/src/v8.cc
@@ -1,4 +1,4 @@
-// Copyright 2011 the V8 project authors. All rights reserved.
+// 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:
@@ -255,9 +255,6 @@ void V8::InitializeOncePerProcess() {
 
   RuntimeProfiler::GlobalSetup();
 
-  // Peephole optimization might interfere with deoptimization.
-  FLAG_peephole_optimization = !use_crankshaft_;
-
   ElementsAccessor::InitializeOncePerProcess();
 
   if (FLAG_stress_compaction) {