RFR: 8204331: AArch64: fix CAS not embedded in normal graph error.

[Andrew Haley]

On 06/05/2018 04:41 PM, Zhongwei Yao wrote:
> Hi,
> 
> Bug:
> https://bugs.openjdk.java.net/browse/JDK-8204331
> 
> Webrev:
> http://cr.openjdk.java.net/~zyao/8204331/webrev.00/
> 
> This patch fixes an assertion error on aarch64 in several jtreg tests. 
> 
> The failure assertion is in needs_acquiring_load_exclusive() in aarch64.ad when checking whether the graph is in "leading_to_normal"  shape. The abnormal shape is generated in  LibraryCallKit::inline_unsafe_load_store(). This patch fixes it by swap the order of "Pin SCMProj node" and "Insert post barrier" in LibraryCallKit::inline_unsafe_load_store().
> 

I don't think this is the right way to fix it.  It'd be better to
fix the code in aarhc64.ad.

-- 
Andrew Haley
Java Platform Lead Engineer
Red Hat UK Ltd. <https://www.redhat.com>
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