hsail lambda-based junits

[Deneau, Tom]

One last webrev for this week...

http://cr.openjdk.java.net/~tdeneau/graal-webrevs/webrev-hsail-lambda-junits/webrev/

Background...
We had originally designed the graal hsail junit infrastructure to support both java 7 methods and java 8 lambdas.  It was actually a little easier to produce tests in the lambda format and we often did that.  But when we started pushing tests out to the graal trunk, we learned that the lambda tests that required java 8 would have to wait until eclipse supported java 8.

In our local repo we kept those in a separate project which @javaCompliance=1.8.   If we really wanted a junit test in trunk, we ported it from java 8 style to java 7 style.  But some tests never got ported.

Anyway, now that graal fully supports java 8, we would like to push these lambda based tests.   Since we don't need a separate project, I just put them as a separate package in the com.oracle.graal.hsail.compiler.test project.

The webrev also includes some minor tidying up of the non-lambda based junits.

-- Tom