[turbofan] Make Float32Neg and Float64Neg mandatory operators.

src/compiler/arm/instruction-selector-arm.cc

 // Copyright 2014 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/base/adapters.h"
 #include "src/base/bits.h"
 #include "src/compiler/instruction-selector-impl.h"
 #include "src/compiler/node-matchers.h"
 #include "src/compiler/node-properties.h"
 
@@ skipping 2267 matching lines @@
   }
   if (CpuFeatures::IsSupported(ARMv8)) {
     flags |= MachineOperatorBuilder::kFloat32RoundDown |
              MachineOperatorBuilder::kFloat64RoundDown |
              MachineOperatorBuilder::kFloat32RoundUp |
              MachineOperatorBuilder::kFloat64RoundUp |
              MachineOperatorBuilder::kFloat32RoundTruncate |
              MachineOperatorBuilder::kFloat64RoundTruncate |
              MachineOperatorBuilder::kFloat64RoundTiesAway |
              MachineOperatorBuilder::kFloat32RoundTiesEven |
-             MachineOperatorBuilder::kFloat64RoundTiesEven |
-             MachineOperatorBuilder::kFloat32Neg |
-             MachineOperatorBuilder::kFloat64Neg;
+             MachineOperatorBuilder::kFloat64RoundTiesEven;
   }
   return flags;
 }
 
 // static
 MachineOperatorBuilder::AlignmentRequirements
 InstructionSelector::AlignmentRequirements() {
   Vector<MachineType> req_aligned = Vector<MachineType>::New(2);
   req_aligned[0] = MachineType::Float32();
   req_aligned[1] = MachineType::Float64();
   return MachineOperatorBuilder::AlignmentRequirements::
       SomeUnalignedAccessUnsupported(req_aligned, req_aligned);
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8