VM: Remove PushTempInstr, simplify SSA renaming.

runtime/vm/constant_propagator.cc

Index: runtime/vm/constant_propagator.cc
diff --git a/runtime/vm/constant_propagator.cc b/runtime/vm/constant_propagator.cc
index 0b8d6178cf92f0cc389ed3ec59f68cdc7cf66c78..4176af4c1c40b2071ef7d68f766b63d660bc53a1 100644
--- a/runtime/vm/constant_propagator.cc
+++ b/runtime/vm/constant_propagator.cc
@@ -403,12 +403,6 @@ void ConstantPropagator::VisitLoadLocal(LoadLocalInstr* instr) {
 }
 
 
-void ConstantPropagator::VisitPushTemp(PushTempInstr* instr) {
-  // Instruction is eliminated when translating to SSA.
-  UNREACHABLE();
-}
-
-
 void ConstantPropagator::VisitDropTemps(DropTempsInstr* instr) {
   // Instruction is eliminated when translating to SSA.
   UNREACHABLE();