Add support for hashing of SelectorList and SelectorValue
Add support for hashing of SelectorList and SelectorValue

Summary: This types are used by Skylark parser to represent `select` statements.

Reviewed By: ttsugriy

fbshipit-source-id: 4dbe49d

romanoid/buck,brettwooldridge/buck,nguyentruongtho/buck,brettwooldridge/buck,romanoid/buck,brettwooldridge/buck,JoelMarcey/buck,SeleniumHQ/buck,facebook/buck,JoelMarcey/buck,JoelMarcey/buck,Addepar/buck,SeleniumHQ/buck,SeleniumHQ/buck,kageiit/buck,brettwooldridge/buck,rmaz/buck,JoelMarcey/buck,kageiit/buck,brettwooldridge/buck,facebook/buck,SeleniumHQ/buck,SeleniumHQ/buck,SeleniumHQ/buck,kageiit/buck,zpao/buck,rmaz/buck,zpao/buck,Addepar/buck,SeleniumHQ/buck,rmaz/buck,Addepar/buck,SeleniumHQ/buck,kageiit/buck,Addepar/buck,romanoid/buck,rmaz/buck,Addepar/buck,Addepar/buck,rmaz/buck,nguyentruongtho/buck,romanoid/buck,Addepar/buck,shs96c/buck,shs96c/buck,zpao/buck,JoelMarcey/buck,nguyentruongtho/buck,SeleniumHQ/buck,JoelMarcey/buck,shs96c/buck,facebook/buck,shs96c/buck,JoelMarcey/buck,rmaz/buck,romanoid/buck,brettwooldridge/buck,facebook/buck,romanoid/buck,shs96c/buck,kageiit/buck,SeleniumHQ/buck,shs96c/buck,zpao/buck,shs96c/buck,nguyentruongtho/buck,Addepar/buck,romanoid/buck,facebook/buck,facebook/buck,shs96c/buck,zpao/buck,rmaz/buck,JoelMarcey/buck,Addepar/buck,shs96c/buck,zpao/buck,brettwooldridge/buck,kageiit/buck,rmaz/buck,Addepar/buck,shs96c/buck,Addepar/buck,rmaz/buck,brettwooldridge/buck,JoelMarcey/buck,JoelMarcey/buck,SeleniumHQ/buck,rmaz/buck,JoelMarcey/buck,rmaz/buck,brettwooldridge/buck,brettwooldridge/buck,JoelMarcey/buck,romanoid/buck,zpao/buck,SeleniumHQ/buck,romanoid/buck,shs96c/buck,nguyentruongtho/buck,kageiit/buck,rmaz/buck,SeleniumHQ/buck,JoelMarcey/buck,brettwooldridge/buck,nguyentruongtho/buck,shs96c/buck,brettwooldridge/buck,romanoid/buck,rmaz/buck,brettwooldridge/buck,shs96c/buck,Addepar/buck,nguyentruongtho/buck,romanoid/buck,Addepar/buck,romanoid/buck,facebook/buck,romanoid/buck