Currently when a new array does not fit into TLAB (big array (FastAllocateSizeLimit) or most common case when no space left in TLAB) C2 calls runtime which does allocation and zeroing. But zeroing is not needed if allocation is followed by arraycopy which initialize it (ReduceBulkZeroing optimization).
Add a new runtime call _new_array_nozero_Java for such case and use it only for type arrays since obj arrays have to be initialized if deoptimization happened on the return from RT to compiled code.
These changes does not affect refworkload scores (including jbb2005). But
crypto.aes (jvm2008) score improved around 10% on sparc. I don't see improvement on x86, may by because it has different crypto code.
Added small fix to prefetch code in sparc arraycopy stub.