Revert 20962 "Break cyclic reference between utils and platform."

Revert 20962 "Break cyclic reference between utils and platform."

>  Platform includes utils.h for the definition of Vector<>, so utils.h
>  can't include platform.h and has to use memcpy instead of OS::MemCopy.
>
>  We split out Vector<> into its own header to break this cycle
>  dependency.
>
>  BUG=none
>  R=mstarzinger@chromium.org
>  LOG=n
>
>  Review URL: https://codereview.chromium.org/251753002

BUG=none
LOG=n
TBR=danno@chromium.org

Committed: https://code.google.com/p/v8/source/detail?r=20976

[jochen (gone - plz use gerrit), 2014-04-25 12:23:22]

Committed patchset #1 manually as r20976 (presubmit successful).