hg: jdk/jdk: 8204479: Bitwise AND on byte value sometimes produces wrong result

[ashipile at redhat.com]

Changeset: 929cd9246fc9
Author:    shade
Date:      2018-06-08 11:41 +0200
URL:       http://hg.openjdk.java.net/jdk/jdk/rev/929cd9246fc9

8204479: Bitwise AND on byte value sometimes produces wrong result
Reviewed-by: kvn, thartmann

! src/hotspot/cpu/x86/x86_64.ad
+ test/hotspot/jtreg/compiler/c2/TestUnsignedByteCompare.java