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

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 744da8f7055263eb45dbca4c7fa8d6eea872d778..69ddd5065f66ba578087a125b5838f3cdfa092b7 100644
--- a/src/compiler/raw-machine-assembler.h
+++ b/src/compiler/raw-machine-assembler.h
@@ -399,6 +399,9 @@ 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);
   }
@@ -437,6 +440,9 @@ 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);
   }