hg: jdk/submit15: 8246051: SIGBUS by unaligned Unsafe compare_and_swap

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Changeset: dc7dd368849b
Author:    aph
Date:      2020-06-29 10:15 -0400
URL:       https://hg.openjdk.java.net/jdk/submit15/rev/dc7dd368849b

8246051: SIGBUS by unaligned Unsafe compare_and_swap
Reviewed-by: aph
Contributed-by: zhuoren.wz at alibaba-inc.com

! src/hotspot/share/prims/unsafe.cpp
+ test/hotspot/jtreg/compiler/unsafe/TestUnsafeUnalignedSwap.java