final graal HSAIL support patch

[Venkatachalam, Vasanth]

Hi Christian,

Here's the final version of our graal HSAIL support patch. This addresses all of Doug Simon's comments.

In particular,


1)      Checkstyle errors have been fixed and all licenses in the Okra packages are attributed to Oracle.

2)      What was previously the com.amd.sumatra package has been removed and its source files (which don't have anything Sumatra specific) have been moved into the com.oracle.graal.compiler.hsail package.

3)      Hotspot c++ source changes have been reverted and are no longer part of the webrev.

Vasanth