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

src/compiler/arm64/instruction-selector-arm64.cc

Index: src/compiler/arm64/instruction-selector-arm64.cc
diff --git a/src/compiler/arm64/instruction-selector-arm64.cc b/src/compiler/arm64/instruction-selector-arm64.cc
index 6106c514f14468f0a86c57a7abebbcc321578ea2..64e7f5f32ba7073f9223c332cdcf7a70f13f89e8 100644
--- a/src/compiler/arm64/instruction-selector-arm64.cc
+++ b/src/compiler/arm64/instruction-selector-arm64.cc
@@ -1520,6 +1520,9 @@ void InstructionSelector::VisitFloat32Sub(Node* node) {
   VisitRRR(this, kArm64Float32Sub, node);
 }
 
+void InstructionSelector::VisitFloat32SubPreserveNan(Node* node) {
+  VisitRRR(this, kArm64Float32Sub, node);
+}
 
 void InstructionSelector::VisitFloat64Sub(Node* node) {
   Arm64OperandGenerator g(this);
@@ -1544,6 +1547,9 @@ void InstructionSelector::VisitFloat64Sub(Node* node) {
   VisitRRR(this, kArm64Float64Sub, node);
 }
 
+void InstructionSelector::VisitFloat64SubPreserveNan(Node* node) {
+  VisitRRR(this, kArm64Float64Sub, node);
+}
 
 void InstructionSelector::VisitFloat32Mul(Node* node) {
   VisitRRR(this, kArm64Float32Mul, node);