Enable Local CSE by default

src/IceTargetLoweringX86BaseImpl.h

 //===- subzero/src/IceTargetLoweringX86BaseImpl.h - x86 lowering -*- C++ -*-==//
 //
 //                        The Subzero Code Generator
 //
 // This file is distributed under the University of Illinois Open Source
 // License. See LICENSE.TXT for details.
 //
 //===----------------------------------------------------------------------===//
 ///
 /// \file
@@ skipping 437 matching lines @@
   // TODO(stichnot,ascull): currently only used for regalloc not
   // expensive high level optimizations which could be focused on potentially
   // hot code.
   Func->generateLoopInfo();
   Func->dump("After loop analysis");
   if (getFlags().getLoopInvariantCodeMotion()) {
     Func->loopInvariantCodeMotion();
     Func->dump("After LICM");
   }
 
-  if (getFlags().getEnableExperimental()) {
+  if (getFlags().getLocalCSE() || getFlags().getLocalCSENoSSA()) {
     Func->localCSE();
     Func->dump("After Local CSE");
   }
   if (getFlags().getEnableShortCircuit()) {
     Func->shortCircuitJumps();
     Func->dump("After Short Circuiting");
   }
 
   if (!getFlags().getEnablePhiEdgeSplit()) {
     // Lower Phi instructions.
@@ skipping 7602 matching lines @@
         emitGlobal(*Var, SectionSuffix);
       }
     }
   } break;
   }
 }
 } // end of namespace X86NAMESPACE
 } // end of namespace Ice
 
 #endif // SUBZERO_SRC_ICETARGETLOWERINGX86BASEIMPL_H