升级 Xcode 8 (Swift 3) 导致工程编译缓慢问题

原stackoverflow上解决方案地址：
http://stackoverflow.com/questions/39632975/xcode-8-swift-3-command-failed-due-to-signal-killed-9

问题描述：

升级Xcode 8 以及 代码迁移到Swift3.0之后，编译swift会变的非常缓慢，花费很长的时间，并且电脑变的非常慢，30分钟后得到了错误信息：

...
 // 主要信息
 Command failed due to signal: Killed: 9
...

造成原因：

   let params : [String: Any] = [ 
        "person_id"           : kPersonId, 
        "person_promo_id"     : promo.personPromoId!, 
        "promo_page_id"       : promo.promoPageId!,                                       
        "seq_no"              : promo.seqNo!, 
        "promo_type"          : promo.promoType!, 
        "page_name"           : promo.pageName!, 
        "image_name"          : promo.imageName!, 
        "start_date"          : promo.startDate!,
        "end_date"            : promo.endDate!, 
        "website"             : promo.website!, 
        "facility_name"       : promo.facilityName!, 
        "address"             : promo.street!, 
        "city"                : promo.city!, 
        "prov_state_cd"       : promo.provState!, 
        "country_cd"          : promo.country!,
        "contact_name"        : promo.contactName!, 
        "contact_phone"       : promo.contactPhone!, 
        "latitude"            : promo.latitude!, 
        "longitude"           : promo.longitude!, 
        "bgColorRed"          : promo.bgColorRed!, 
        "bgColorGreen"        : promo.bgColorGreen!, 
        "bgColorBlue"         : promo.bgColorBlue!, 
        "promoCategories"     : promoCat
   ]

像文件中含有这样的字典，会导致编译速度非常缓慢。

解决方案：

var params : [String : Any] = [:]
params["person_id"]       = kPersonId
params["person_promo_id"] = promo.personPromoId
params["promo_page_id"]   = promo.promoPageId
params["seq_no"]          = promo.seqNo
params["promo_type"]      = promo.promoType
params["page_name"]       = promo.pageName
params["image_name"]      = promo.imageName
params["start_date"]      = promo.startDate
params["end_date"]        = promo.endDate
params["website"]         = promo.website
params["facility_name"]   = promo.facilityName
params["address"]         = promo.street
params["city"]            = promo.city
params["prov_state_cd"]   = promo.provState
params["country_cd"]      = promo.country
params["contact_name"]    = promo.contactName
params["contact_phone"]   = promo.contactPhone
params["latitude"]        = promo.latitude
params["longitude"]       = promo.longitude
params["bgColorRed"]      = promo.bgColorRed
params["bgColorGreen"]    = promo.bgColorGreen
params["bgColorBlue"]     = promo.bgColorBlue
params["promoCategories"] = promoCat