webrev to enable arraycopy support in hsail backend

[Deneau, Tom]

I placed a small webrev up at
http://cr.openjdk.java.net/~tdeneau/graal-webrevs/webrev-hsail-arraycopy-support/webrev/

The purpose is to allow System.arraycopy (or at least most flavors of it) to be used in hsail kernels.  Note that even if kernels do not use it directly, System.arrayCopy is used in many JDK routines, for example Stringbuilder.append(), ArrayList.get, etc.  One flavor that is not supported yet is for example an Object array copy where the destination is a superclass of the source.

The changes to HSAILHotSpotReplacementsImpl.java is just a way to take the non-foreign-call path (which hsail kernels cannot handle) regardless of the sense of the global flag CallArrayCopy (default true).

The rest of the webrev is either new specific arraycopy tests, or enabling of some tests that were previously ignored because they needed arraycopy support.

-- Tom