[wasm] Add ProtectedStore instruction

src/compiler/x87/instruction-selector-x87.cc

Index: src/compiler/x87/instruction-selector-x87.cc
diff --git a/src/compiler/x87/instruction-selector-x87.cc b/src/compiler/x87/instruction-selector-x87.cc
index a737d1e9e860ecc044c78cb6a3bffc18cad16575..f6ac2120c839bbb334450b306edc5e32765bc66d 100644
--- a/src/compiler/x87/instruction-selector-x87.cc
+++ b/src/compiler/x87/instruction-selector-x87.cc
@@ -312,6 +312,11 @@ 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(); }