Delete code for the now unused IL instruction NumberNegate.

runtime/vm/intermediate_language.cc

 // 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.
 
 #include "vm/intermediate_language.h"
 
 #include "vm/bit_vector.h"
 #include "vm/dart_entry.h"
 #include "vm/flow_graph_allocator.h"
 #include "vm/flow_graph_builder.h"
@@ skipping 1105 matching lines @@
 RawAbstractType* BoxDoubleInstr::CompileType() const {
   return Type::Double();
 }
 
 
 RawAbstractType* UnarySmiOpInstr::CompileType() const {
   return Type::SmiType();
 }
 
 
-RawAbstractType* NumberNegateInstr::CompileType() const {
-  // Implemented only for doubles.
-  return Type::Double();
-}
-
-
 RawAbstractType* DoubleToDoubleInstr::CompileType() const {
   return Type::Double();
 }
 
 
 RawAbstractType* SmiToDoubleInstr::CompileType() const {
   return Type::Double();
 }
 
 
@@ skipping 550 matching lines @@
     value->set_use_index(use_index++);
     value->AddToEnvUseList();
   }
   instr->set_env(copy);
 }
 
 
 #undef __
 
 }  // namespace dart