[wasm] Add ProtectedStore instruction

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

Index: src/compiler/mips/instruction-selector-mips.cc
diff --git a/src/compiler/mips/instruction-selector-mips.cc b/src/compiler/mips/instruction-selector-mips.cc
index a8aa7c17c5840ba6c54a15a6ed9da003f4b7c2a1..ecf087fdab282fa7b7143aaf02fb611a2888bd10 100644
--- a/src/compiler/mips/instruction-selector-mips.cc
+++ b/src/compiler/mips/instruction-selector-mips.cc
@@ -368,6 +368,10 @@ void InstructionSelector::VisitStore(Node* node) {
   }
 }
 
+void InstructionSelector::VisitProtectedStore(Node* node) {
+  // TODO(eholk)
+  UNIMPLEMENTED();
+}
 
 void InstructionSelector::VisitWord32And(Node* node) {
   MipsOperandGenerator g(this);