Bug 1402285 - Don't try to cache pseudo styles with an unstyled originating element. r=emilio

MozReview-Commit-ID: C4JNZFtYHBH

layout/style/ServoStyleSet.cpp

@@ -555,6 +555,7 @@ LazyPseudoIsCacheable(CSSPseudoElementType aType,
 {
   return aParentContext &&
          !nsCSSPseudoElements::IsEagerlyCascadedInServo(aType) &&
+         aOriginatingElement->HasServoData() &&
          !Servo_Element_IsPrimaryStyleReusedViaRuleNode(aOriginatingElement);
 }