[wasm] Add ProtectedStore instruction

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

Index: src/compiler/arm/instruction-selector-arm.cc
diff --git a/src/compiler/arm/instruction-selector-arm.cc b/src/compiler/arm/instruction-selector-arm.cc
index 5279d1eec1e31bba0863b4a88e8cf93c4b2a1d45..95b9c78c96b06b7c176bbe44d6b4ed42183c28d6 100644
--- a/src/compiler/arm/instruction-selector-arm.cc
+++ b/src/compiler/arm/instruction-selector-arm.cc
@@ -501,6 +501,11 @@ void InstructionSelector::VisitStore(Node* node) {
   }
 }
 
+void InstructionSelector::VisitProtectedStore(Node* node) {
+  // TODO(eholk)
+  UNIMPLEMENTED();
+}
+
 void InstructionSelector::VisitUnalignedLoad(Node* node) {
   UnalignedLoadRepresentation load_rep =
       UnalignedLoadRepresentationOf(node->op());