Put PushArgument into the environment instead of raw values.

runtime/vm/flow_graph_allocator.h

 // Copyright (c) 2012, 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.
 
 #ifndef VM_FLOW_GRAPH_ALLOCATOR_H_
 #define VM_FLOW_GRAPH_ALLOCATOR_H_
 
 #include "vm/growable_array.h"
 #include "vm/intermediate_language.h"
 
@@ skipping 73 matching lines @@
   // It will be used later in SplitBetween heuristic that selects an
   // optimal splitting position.
   void DiscoverLoops();
 
   LiveRange* MakeLiveRangeForTemporary();
 
   // Visit instructions in the postorder and build live ranges for
   // all SSA values.
   void BuildLiveRanges();
   Instruction* ConnectOutgoingPhiMoves(BlockEntryInstr* block);
+  void ProcessEnvironmentUses(BlockEntryInstr* block, Instruction* current);
   void ProcessOneInstruction(BlockEntryInstr* block, Instruction* instr);
   void ConnectIncomingPhiMoves(BlockEntryInstr* block);
   void BlockLocation(Location loc, intptr_t from, intptr_t to);
 
   // Process live ranges sorted by their start and assign registers
   // to them
   void AllocateCPURegisters();
   void AdvanceActiveIntervals(const intptr_t start);
 
   // Connect split siblings over non-linear control flow edges.
@@ skipping 355 matching lines @@
 
   AllocationFinger finger_;
 
   DISALLOW_COPY_AND_ASSIGN(LiveRange);
 };
 
 
 }  // namespace dart
 
 #endif  // VM_FLOW_GRAPH_ALLOCATOR_H_