[arm] [arm64] Add optional operators Float32Neg and Float64Neg.

src/compiler/arm64/code-generator-arm64.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/compiler/code-generator.h"
 
 #include "src/arm64/frames-arm64.h"
 #include "src/arm64/macro-assembler-arm64.h"
 #include "src/ast/scopes.h"
 #include "src/compiler/code-generator-impl.h"
@@ skipping 1165 matching lines @@
       break;
     case kArm64Float32Min:
       // (a < b) ? a : b
       __ Fcmp(i.InputFloat32Register(0), i.InputFloat32Register(1));
       __ Fcsel(i.OutputFloat32Register(), i.InputFloat32Register(0),
                i.InputFloat32Register(1), lo);
       break;
     case kArm64Float32Abs:
       __ Fabs(i.OutputFloat32Register(), i.InputFloat32Register(0));
       break;
+    case kArm64Float32Neg:
+      __ Fneg(i.OutputFloat32Register(), i.InputFloat32Register(0));
+      break;
     case kArm64Float32Sqrt:
       __ Fsqrt(i.OutputFloat32Register(), i.InputFloat32Register(0));
       break;
     case kArm64Float64Cmp:
       if (instr->InputAt(1)->IsFPRegister()) {
         __ Fcmp(i.InputDoubleRegister(0), i.InputDoubleRegister(1));
       } else {
         DCHECK(instr->InputAt(1)->IsImmediate());
         // 0.0 is the only immediate supported by fcmp instructions.
         DCHECK(i.InputDouble(1) == 0.0);
@@ skipping 706 matching lines @@
       padding_size -= kInstructionSize;
     }
   }
 }
 
 #undef __
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8