RFR: 8146994: Move internal vm tests to a separate file

[Erik Helin]

Hi all,

this patch moves the internal vm tests (the ones executed via
-XX:+ExecuteInternalVMTests) to new files:
utilities/internalVMTests.{hpp,cpp}

Please note that this patch only moves the tests (and adds includes
required to build) on purpose, I have more patches coming that cleans up
the internal vm tests a bit.

Enhancement:
https://bugs.openjdk.java.net/browse/JDK-8146994

Webrev:
http://cr.openjdk.java.net/~ehelin/8146994/00/

Testing:
- Running test locally
- Running tests in JPRT

Thanks,
Erik