VM: Remove PushTempInstr, simplify SSA renaming.

runtime/vm/flow_graph_compiler_dbc.cc

 // Copyright (c) 2016, 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/globals.h"  // Needed here to get TARGET_ARCH_DBC.
 #if defined(TARGET_ARCH_DBC)
 
 #include "vm/flow_graph_compiler.h"
 
 #include "vm/ast_printer.h"
@@ skipping 114 matching lines @@
 void FlowGraphCompiler::EmitInstructionEpilogue(Instruction* instr) {
   if (!is_optimizing()) {
     Definition* defn = instr->AsDefinition();
     if ((defn != NULL) &&
         (defn->tag() != Instruction::kPushArgument) &&
         (defn->tag() != Instruction::kStoreIndexed) &&
         (defn->tag() != Instruction::kStoreStaticField) &&
         (defn->tag() != Instruction::kStoreLocal) &&
         (defn->tag() != Instruction::kStoreInstanceField) &&
         (defn->tag() != Instruction::kDropTemps) &&
-        (defn->tag() != Instruction::kPushTemp) &&
         !defn->HasTemp()) {
       __ Drop1();
     }
   }
 }
 
 
 void FlowGraphCompiler::GenerateInlinedGetter(intptr_t offset) {
   __ Move(0, -(1 + kParamEndSlotFromFp));
   __ LoadField(0, 0, offset / kWordSize);
@@ skipping 176 matching lines @@
 void ParallelMoveResolver::RestoreFpuScratch(FpuRegister reg) {
   UNIMPLEMENTED();
 }
 
 
 #undef __
 
 }  // namespace dart
 
 #endif  // defined TARGET_ARCH_DBC