hg: jdk8u/jdk8u-dev/hotspot: 8075136: Unnecessary sign extension for byte array access

[shade at redhat.com]

Changeset: afa42cf8d060
Author:    thartmann
Date:      2015-03-23 10:15 +0100
URL:       https://hg.openjdk.java.net/jdk8u/jdk8u-dev/hotspot/rev/afa42cf8d060

8075136: Unnecessary sign extension for byte array access
Summary: Added C2 matching rules to remove unnecessary sign extension for byte array access.
Reviewed-by: roland, kvn, aph, adinn

! src/cpu/x86/vm/x86_64.ad