RFR: 8150394: aarch64: add support for 8.1 LSE CAS instructions

Andrew Haley aph at redhat.com
Wed Feb 24 12:49:30 UTC 2016

One more thing: with 8148146 we have new entry points and C2 nodes
for WeakCompareAndSwapX.  We'll need to add a "bool weak" parameter
to MacroAssembler::cmpxchgw.  I suppose it's OK for this to be done
in a later commit.


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