RFA: [8u-dev] 8141491: Unaligned memory access in Bits.c

[David Buck]

Hi!

May I please get approval to push this backport into 8u-dev. The fix is 
critical for JDK 8 when built with recent versions of gcc.

bug report:
https://bugs.openjdk.java.net/browse/JDK-8141491

code review of backport:
http://mail.openjdk.java.net/pipermail/nio-dev/2018-November/005556.html
http://mail.openjdk.java.net/pipermail/hotspot-runtime-dev/2018-December/031556.html

final version of backport reviewed in thread above:
http://cr.openjdk.java.net/~dbuck/8141491_jdk8_ver01/

Cheers,
-Buck