[turbofan] Make Float32Neg and Float64Neg mandatory operators.

src/compiler/mips64/instruction-selector-mips64.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 1282 matching lines @@
 
 void InstructionSelector::VisitFloat32RoundTiesEven(Node* node) {
   VisitRR(this, kMips64Float32RoundTiesEven, node);
 }
 
 
 void InstructionSelector::VisitFloat64RoundTiesEven(Node* node) {
   VisitRR(this, kMips64Float64RoundTiesEven, node);
 }
 
-void InstructionSelector::VisitFloat32Neg(Node* node) { UNREACHABLE(); }
+void InstructionSelector::VisitFloat32Neg(Node* node) {
+  VisitRR(this, kMips64NegS, node);
+}
 
-void InstructionSelector::VisitFloat64Neg(Node* node) { UNREACHABLE(); }
+void InstructionSelector::VisitFloat64Neg(Node* node) {
+  VisitRR(this, kMips64NegD, node);
+}
 
 void InstructionSelector::VisitFloat64Ieee754Binop(Node* node,
                                                    InstructionCode opcode) {
   Mips64OperandGenerator g(this);
   Emit(opcode, g.DefineAsFixed(node, f0), g.UseFixed(node->InputAt(0), f2),
        g.UseFixed(node->InputAt(1), f4))
       ->MarkAsCall();
 }
 
 void InstructionSelector::VisitFloat64Ieee754Unop(Node* node,
@@ skipping 839 matching lines @@
   } else {
     DCHECK(kArchVariant == kMips64r2);
     return MachineOperatorBuilder::AlignmentRequirements::
         NoUnalignedAccessSupport();
   }
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8