Fix "unused variable" warnings

hphp/runtime/vm/translator/hopt/tracebuilder.cpp

@@ -340,7 +340,6 @@ void TraceBuilder::updateTrackedState(IRInstruction* inst) {
   case InterpOne: {
     m_spValue = inst->getDst();
     int64_t stackAdjustment = inst->getSrc(3)->getValInt();
-    Type resultType = inst->getTypeParam();
     // push the return value if any and adjust for the popped values
     m_spOffset -= stackAdjustment;
     break;

hphp/runtime/vm/translator/hopt/vectortranslator-internal.h

@@ -106,7 +106,7 @@ inline unsigned buildBitmask(T c, Args... args) {
 // both, respectively.
 static KeyType getKeyType(const SSATmp* key, bool nonLitStr,
                           bool nonLitInt) {
-  auto keyType = key->type();
+  auto DEBUG_ONLY keyType = key->type();
   assert(keyType.notBoxed());
   assert(keyType.isKnownDataType() || keyType.equals(Type::Cell));