small webrev for issues in hsail junit testing

[Deneau, Tom]

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

This mostly contains some tweaks related to our hsail junit testing

*         mark some tests as requiring ObjectAllocation so they will not fail when UseHSAILDeoptimization is turned off

*         mark some tests as not to run on hardware until some hardware problems are fixed.

*         Fix code sequence in HSAILHotSpotBackend.java for hardware which has more strict HSAIL assembler (no longer allows ld_u32 into a $d register)

*         in HSAILAssembler.mapAddress, handle case where there is no base register

-- Tom