[turbofan] Remove the FloatXXSubPreserveNan operators.

src/compiler/machine-operator.cc

Index: src/compiler/machine-operator.cc
diff --git a/src/compiler/machine-operator.cc b/src/compiler/machine-operator.cc
index 284caf30620c1ada957ea51d5c7c967d8200fa13..09b37a8761c3e6c82326bdc8e9caf5244956116b 100644
--- a/src/compiler/machine-operator.cc
+++ b/src/compiler/machine-operator.cc
@@ -160,7 +160,6 @@ MachineRepresentation AtomicStoreRepresentationOf(Operator const* op) {
   V(Float32Abs, Operator::kNoProperties, 1, 0, 1)                            \
   V(Float32Add, Operator::kCommutative, 2, 0, 1)                             \
   V(Float32Sub, Operator::kNoProperties, 2, 0, 1)                            \
-  V(Float32SubPreserveNan, Operator::kNoProperties, 2, 0, 1)                 \
   V(Float32Mul, Operator::kCommutative, 2, 0, 1)                             \
   V(Float32Div, Operator::kNoProperties, 2, 0, 1)                            \
   V(Float32Neg, Operator::kNoProperties, 1, 0, 1)                            \
@@ -187,7 +186,6 @@ MachineRepresentation AtomicStoreRepresentationOf(Operator const* op) {
   V(Float64Neg, Operator::kNoProperties, 1, 0, 1)                            \
   V(Float64Add, Operator::kCommutative, 2, 0, 1)                             \
   V(Float64Sub, Operator::kNoProperties, 2, 0, 1)                            \
-  V(Float64SubPreserveNan, Operator::kNoProperties, 2, 0, 1)                 \
   V(Float64Mul, Operator::kCommutative, 2, 0, 1)                             \
   V(Float64Div, Operator::kNoProperties, 2, 0, 1)                            \
   V(Float64Mod, Operator::kNoProperties, 2, 0, 1)                            \