VM: Remove PushTempInstr, simplify SSA renaming.

runtime/vm/intermediate_language.h

 // Copyright (c) 2013, 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_INTERMEDIATE_LANGUAGE_H_
 #define VM_INTERMEDIATE_LANGUAGE_H_
 
 #include "vm/allocation.h"
 #include "vm/ast.h"
 #include "vm/growable_array.h"
@@ skipping 436 matching lines @@
   M(IndirectGoto)                                                              \
   M(Branch)                                                                    \
   M(AssertAssignable)                                                          \
   M(AssertBoolean)                                                             \
   M(CurrentContext)                                                            \
   M(ClosureCall)                                                               \
   M(InstanceCall)                                                              \
   M(PolymorphicInstanceCall)                                                   \
   M(StaticCall)                                                                \
   M(LoadLocal)                                                                 \
-  M(PushTemp)                                                                  \
   M(DropTemps)                                                                 \
   M(StoreLocal)                                                                \
   M(StrictCompare)                                                             \
   M(EqualityCompare)                                                           \
   M(RelationalOp)                                                              \
   M(NativeCall)                                                                \
   M(DebugStepCheck)                                                            \
   M(LoadIndexed)                                                               \
   M(LoadCodeUnits)                                                             \
   M(StoreIndexed)                                                              \
@@ skipping 2893 matching lines @@
 
  private:
   const LocalVariable& local_;
   bool is_last_;
   const TokenPosition token_pos_;
 
   DISALLOW_COPY_AND_ASSIGN(LoadLocalInstr);
 };
 
 
-class PushTempInstr : public TemplateDefinition<1, NoThrow> {
- public:
-  explicit PushTempInstr(Value* value) {
-    SetInputAt(0, value);
-  }
-
-  DECLARE_INSTRUCTION(PushTemp)
-
-  Value* value() const { return inputs_[0]; }
-
-  virtual CompileType ComputeType() const;
-
-  virtual bool CanDeoptimize() const { return false; }
-
-  virtual EffectSet Effects() const {
-    UNREACHABLE();  // Eliminated by SSA construction.
-    return EffectSet::None();
-  }
-
-  virtual TokenPosition token_pos() const {
-    return TokenPosition::kTempMove;
-  }
-
- private:
-  DISALLOW_COPY_AND_ASSIGN(PushTempInstr);
-};
-
-
 class DropTempsInstr : public Definition {
  public:
   DropTempsInstr(intptr_t num_temps, Value* value)
       : num_temps_(num_temps), value_(NULL) {
     if (value != NULL) {
       SetInputAt(0, value);
     }
   }
 
   DECLARE_INSTRUCTION(DropTemps)
@@ skipping 4880 matching lines @@
   LocationSummary* Name::MakeLocationSummary(Zone* zone, bool opt) const {    \
     UNIMPLEMENTED();                                                          \
     return NULL;                                                              \
   }                                                                           \
   void Name::EmitNativeCode(FlowGraphCompiler* compiler) { UNIMPLEMENTED(); }
 
 
 }  // namespace dart
 
 #endif  // VM_INTERMEDIATE_LANGUAGE_H_