[turbofan] Make Float32Neg and Float64Neg mandatory operators.

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

Index: src/compiler/arm/instruction-selector-arm.cc
diff --git a/src/compiler/arm/instruction-selector-arm.cc b/src/compiler/arm/instruction-selector-arm.cc
index 37ec6314b84d4c82174fb121a7e5c192c0469916..27e86b5f5b1db0606f0b4badd01213cf95c5cf27 100644
--- a/src/compiler/arm/instruction-selector-arm.cc
+++ b/src/compiler/arm/instruction-selector-arm.cc
@@ -2285,9 +2285,7 @@ InstructionSelector::SupportedMachineOperatorFlags() {
              MachineOperatorBuilder::kFloat64RoundTruncate |
              MachineOperatorBuilder::kFloat64RoundTiesAway |
              MachineOperatorBuilder::kFloat32RoundTiesEven |
-             MachineOperatorBuilder::kFloat64RoundTiesEven |
-             MachineOperatorBuilder::kFloat32Neg |
-             MachineOperatorBuilder::kFloat64Neg;
+             MachineOperatorBuilder::kFloat64RoundTiesEven;
   }
   return flags;
 }