Remove unused --peephole-optimization flag.

src/v8.cc

-// 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:
 //
 //     * 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
 //       with the distribution.
@@ skipping 236 matching lines @@
     use_crankshaft_ = false;
   }
 
   CPU::SetUp();
   if (!CPU::SupportsCrankshaft()) {
     use_crankshaft_ = false;
   }
 
   RuntimeProfiler::GlobalSetup();
 
-  // Peephole optimization might interfere with deoptimization.
-  FLAG_peephole_optimization = !use_crankshaft_;
-
   ElementsAccessor::InitializeOncePerProcess();
 
   if (FLAG_stress_compaction) {
     FLAG_force_marking_deque_overflows = true;
     FLAG_gc_global = true;
     FLAG_max_new_space_size = (1 << (kPageSizeBits - 10)) * 2;
   }
 }
 
 } }  // namespace v8::internal