[wasm] Add ProtectedStore instruction

src/compiler/s390/instruction-selector-s390.cc

Index: src/compiler/s390/instruction-selector-s390.cc
diff --git a/src/compiler/s390/instruction-selector-s390.cc b/src/compiler/s390/instruction-selector-s390.cc
index 92705fc5b0aa08a9f3a7422258fa3d504a94d8c9..3c9502fd0914e0101b9c9c92bd1122ec31bb2c6a 100644
--- a/src/compiler/s390/instruction-selector-s390.cc
+++ b/src/compiler/s390/instruction-selector-s390.cc
@@ -440,6 +440,11 @@ void InstructionSelector::VisitStore(Node* node) {
   }
 }
 
+void InstructionSelector::VisitProtectedStore(Node* node) {
+  // TODO(eholk)
+  UNIMPLEMENTED();
+}
+
 // Architecture supports unaligned access, therefore VisitLoad is used instead
 void InstructionSelector::VisitUnalignedLoad(Node* node) { UNREACHABLE(); }