VM: Remove more duplicate code between AOT and JIT compiler.

runtime/vm/precompiler.cc

 // Copyright (c) 2015, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #include "vm/precompiler.h"
 
 #include "vm/aot_optimizer.h"
 #include "vm/assembler.h"
 #include "vm/ast_printer.h"
 #include "vm/branch_optimizer.h"
@@ skipping 2408 matching lines @@
         DEBUG_ASSERT(flow_graph->VerifyUseLists());
 
         FlowGraphTypePropagator::Propagate(flow_graph);
         DEBUG_ASSERT(flow_graph->VerifyUseLists());
 
         optimizer.ApplyICData();
         DEBUG_ASSERT(flow_graph->VerifyUseLists());
 
         // Optimize (a << b) & c patterns, merge operations.
         // Run early in order to have more opportunity to optimize left shifts.
-        optimizer.TryOptimizePatterns();
+        flow_graph->TryOptimizePatterns();
         DEBUG_ASSERT(flow_graph->VerifyUseLists());
 
         FlowGraphInliner::SetInliningId(flow_graph, 0);
 
         // Inlining (mutates the flow graph)
         if (FLAG_use_inlining) {
 #ifndef PRODUCT
           TimelineDurationScope tds2(thread(),
                                      compiler_timeline,
                                      "Inlining");
@@ skipping 139 matching lines @@
             LICM licm(flow_graph);
             licm.Optimize();
             DEBUG_ASSERT(flow_graph->VerifyUseLists());
           }
           flow_graph->RemoveRedefinitions();
         }
 
         // Optimize (a << b) & c patterns, merge operations.
         // Run after CSE in order to have more opportunity to merge
         // instructions that have same inputs.
-        optimizer.TryOptimizePatterns();
+        flow_graph->TryOptimizePatterns();
         DEBUG_ASSERT(flow_graph->VerifyUseLists());
 
         {
 #ifndef PRODUCT
           TimelineDurationScope tds2(thread(),
                                      compiler_timeline,
                                      "DeadStoreElimination");
 #endif  // !PRODUCT
           DeadStoreElimination::Optimize(flow_graph);
         }
@@ skipping 330 matching lines @@
       CompilationPipeline::New(thread->zone(), function);
 
   ASSERT(FLAG_precompiled_mode);
   const bool optimized = function.IsOptimizable();  // False for natives.
   return PrecompileFunctionHelper(pipeline, function, optimized);
 }
 
 #endif  // DART_PRECOMPILER
 
 }  // namespace dart