[wasm] Add ProtectedStore instruction

src/compiler/ia32/instruction-selector-ia32.cc

Index: src/compiler/ia32/instruction-selector-ia32.cc
diff --git a/src/compiler/ia32/instruction-selector-ia32.cc b/src/compiler/ia32/instruction-selector-ia32.cc
index 9e4db30308703afb6054521dd1de63e3d2ac48fe..bb0be9ac6807ae3de1796ad2b4089e977f146d76 100644
--- a/src/compiler/ia32/instruction-selector-ia32.cc
+++ b/src/compiler/ia32/instruction-selector-ia32.cc
@@ -351,6 +351,11 @@ 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(); }