[turbofan] Remove the FloatXXSubPreserveNan operators.

src/compiler/raw-machine-assembler.h

Index: src/compiler/raw-machine-assembler.h
diff --git a/src/compiler/raw-machine-assembler.h b/src/compiler/raw-machine-assembler.h
index 2a5ae1f8f1e64a89b151e1b7808fd84f813eb2ca..f1bc3d789762eb3bd0338e4445c37310dbe5dc0b 100644
--- a/src/compiler/raw-machine-assembler.h
+++ b/src/compiler/raw-machine-assembler.h
@@ -433,9 +433,6 @@ class RawMachineAssembler {
   Node* Float32Sub(Node* a, Node* b) {
     return AddNode(machine()->Float32Sub(), a, b);
   }
-  Node* Float32SubPreserveNan(Node* a, Node* b) {
-    return AddNode(machine()->Float32SubPreserveNan(), a, b);
-  }
   Node* Float32Mul(Node* a, Node* b) {
     return AddNode(machine()->Float32Mul(), a, b);
   }
@@ -468,9 +465,6 @@ class RawMachineAssembler {
   Node* Float64Sub(Node* a, Node* b) {
     return AddNode(machine()->Float64Sub(), a, b);
   }
-  Node* Float64SubPreserveNan(Node* a, Node* b) {
-    return AddNode(machine()->Float64SubPreserveNan(), a, b);
-  }
   Node* Float64Mul(Node* a, Node* b) {
     return AddNode(machine()->Float64Mul(), a, b);
   }