Move VM specific library files to the runtime/lib directory so they do

Move VM specific library files to the runtime/lib directory so they do
not become part of the SDK.

We should get rid of these files and use the real library file that
sources the rest of the implementation. That work is tracked in
dartbug.com/5099.

R=iposva@google.com
BUG=dartbug.com/5069

Committed: https://code.google.com/p/dart/source/detail?r=12240

[Ivan Posva, 2012-09-12 07:34:59]

LGTM -ip