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

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

Don't use OS::MemCopy in BitCast. It's crucial that the compiler can
optimize the memcpy away.

>  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

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

Committed: https://code.google.com/p/v8/source/detail?r=20983

[jochen (gone - plz use gerrit), 2014-04-25 13:44:06]

Committed patchset #1 manually as r20983 (presubmit successful).

[Jakob Kummerow, 2014-04-25 13:44:50]

lgtm