RFR(S): 8216989 - CardTableBarrierSetAssembler::gen_write_ref_array_post_barrier() does not check for zero length on AARCH64

[Dmitrij Pochepko]

Hi all,

please review patch for JDK-8216989 
CardTableBarrierSetAssembler::gen_write_ref_array_post_barrier() does 
not check for zero length on AARCH64
webrev: http://cr.openjdk.java.net/~dpochepk/8216989/webrev.01/

All platforms except AARCH64 performs zero length check in arraycopy 
post barrier and skip card marking for zero length arrays. Missing check 
can lead to wrong card marking. This patch adds such check.

Testing (using parallel gc, because default g1 is not affected):

- JCK
- jtreg hotspot tests: compiler/*, gc/* and runtime/*
- jtreg jdk tier1-3 tests

no regressions found.

CR: https://bugs.openjdk.java.net/browse/JDK-8216989

Thanks,
Dmitrij

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