[turbofan] Remove the FloatXXSubPreserveNan operators.

src/compiler/x64/instruction-selector-x64.cc

Index: src/compiler/x64/instruction-selector-x64.cc
diff --git a/src/compiler/x64/instruction-selector-x64.cc b/src/compiler/x64/instruction-selector-x64.cc
index ffde311da1aeff6d19d69ee80789924f76ff673b..7aaeb69eaeecc6bf959b67219a041a03839490a6 100644
--- a/src/compiler/x64/instruction-selector-x64.cc
+++ b/src/compiler/x64/instruction-selector-x64.cc
@@ -1307,17 +1307,6 @@ void InstructionSelector::VisitFloat32Add(Node* node) {
 
 
 void InstructionSelector::VisitFloat32Sub(Node* node) {
-  X64OperandGenerator g(this);
-  Float32BinopMatcher m(node);
-  if (m.left().IsMinusZero()) {
-    VisitFloatUnop(this, node, m.right().node(), kAVXFloat32Neg,
-                   kSSEFloat32Neg);
-    return;
-  }
-  VisitFloatBinop(this, node, kAVXFloat32Sub, kSSEFloat32Sub);
-}
-
-void InstructionSelector::VisitFloat32SubPreserveNan(Node* node) {
   VisitFloatBinop(this, node, kAVXFloat32Sub, kSSEFloat32Sub);
 }
 
@@ -1347,29 +1336,6 @@ void InstructionSelector::VisitFloat64Add(Node* node) {
 
 
 void InstructionSelector::VisitFloat64Sub(Node* node) {
-  X64OperandGenerator g(this);
-  Float64BinopMatcher m(node);
-  if (m.left().IsMinusZero()) {
-    if (m.right().IsFloat64RoundDown() &&
-        CanCover(m.node(), m.right().node())) {
-      if (m.right().InputAt(0)->opcode() == IrOpcode::kFloat64Sub &&
-          CanCover(m.right().node(), m.right().InputAt(0))) {
-        Float64BinopMatcher mright0(m.right().InputAt(0));
-        if (mright0.left().IsMinusZero()) {
-          Emit(kSSEFloat64Round | MiscField::encode(kRoundUp),
-               g.DefineAsRegister(node), g.UseRegister(mright0.right().node()));
-          return;
-        }
-      }
-    }
-    VisitFloatUnop(this, node, m.right().node(), kAVXFloat64Neg,
-                   kSSEFloat64Neg);
-    return;
-  }
-  VisitFloatBinop(this, node, kAVXFloat64Sub, kSSEFloat64Sub);
-}
-
-void InstructionSelector::VisitFloat64SubPreserveNan(Node* node) {
   VisitFloatBinop(this, node, kAVXFloat64Sub, kSSEFloat64Sub);
 }