hg: jdk/submit: 8242429: Better implementation for sign extract

[ningsheng.jian at arm.com]

Changeset: d0bb66fdf222
Author:    njian
Date:      2020-04-17 17:36 +0800
URL:       https://hg.openjdk.java.net/jdk/submit/rev/d0bb66fdf222

8242429: Better implementation for sign extract
Reviewed-by: vlivanov

diff a/src/hotspot/cpu/aarch64/aarch64.ad b/src/hotspot/cpu/aarch64/aarch64.ad

! src/hotspot/cpu/aarch64/aarch64.ad
! src/hotspot/share/opto/mulnode.cpp
! src/hotspot/share/opto/subnode.cpp