hg: jdk10/hs/hotspot: 8184900: AArch64: Fix overflow in immediate cmp instruction

[felix.yang at linaro.org]

Changeset: 23e687f0c874
Author:    yzhang
Date:      2017-07-26 15:54 +0800
URL:       http://hg.openjdk.java.net/jdk10/hs/hotspot/rev/23e687f0c874

8184900: AArch64: Fix overflow in immediate cmp instruction
Summary: Use subs instead of cmp to compare BlockZeroingLowLimit.
Reviewed-by: aph
Contributed-by: yang.zhang at linaro.org

! src/cpu/aarch64/vm/macroAssembler_aarch64.hpp
! src/cpu/aarch64/vm/stubGenerator_aarch64.cpp