[turbofan] Introduce new operators Float32SubPreserveNan and Float64SubPreserveNan for wasm.

src/compiler/instruction-selector.cc

Index: src/compiler/instruction-selector.cc
diff --git a/src/compiler/instruction-selector.cc b/src/compiler/instruction-selector.cc
index 7589102d8eb8d75fc97581da1ac5758eca3374a9..41ab1379136071cb1a8fab7f459f2fc6da378b37 100644
--- a/src/compiler/instruction-selector.cc
+++ b/src/compiler/instruction-selector.cc
@@ -1075,6 +1075,8 @@ void InstructionSelector::VisitNode(Node* node) {
       return MarkAsFloat32(node), VisitFloat32Add(node);
     case IrOpcode::kFloat32Sub:
       return MarkAsFloat32(node), VisitFloat32Sub(node);
+    case IrOpcode::kFloat32SubPreserveNan:
+      return MarkAsFloat32(node), VisitFloat32SubPreserveNan(node);
     case IrOpcode::kFloat32Mul:
       return MarkAsFloat32(node), VisitFloat32Mul(node);
     case IrOpcode::kFloat32Div:
@@ -1097,6 +1099,8 @@ void InstructionSelector::VisitNode(Node* node) {
       return MarkAsFloat64(node), VisitFloat64Add(node);
     case IrOpcode::kFloat64Sub:
       return MarkAsFloat64(node), VisitFloat64Sub(node);
+    case IrOpcode::kFloat64SubPreserveNan:
+      return MarkAsFloat64(node), VisitFloat64SubPreserveNan(node);
     case IrOpcode::kFloat64Mul:
       return MarkAsFloat64(node), VisitFloat64Mul(node);
     case IrOpcode::kFloat64Div: