Fix simplifyStoreSubscr missing a UseType

Summary:
Another case of the JIT depending on a type produced by a guard, without
registering that dependency.  This led to the crash in T259580456.

Reviewed By: yoney

Differential Revision: D96934158

fbshipit-source-id: bdf946134b677683aa76371cdda78e68d5cb352b

Author: alexmalyshev

cinderx/Jit/hir/simplify.cpp

@@ -1907,6 +1907,7 @@ Register* simplifyVectorCall(Env& env, const VectorCall* instr) {
 
 Register* simplifyStoreSubscr(Env& env, const StoreSubscr* instr) {
   if (instr->GetOperand(0)->isA(TDictExact)) {
+    env.emit<UseType>(instr->GetOperand(0), TDictExact);
     auto output = env.func.env.AllocateRegister();
     env.emitRawInstr<CallStatic>(
         3,