git: openjdk/jdk-sandbox: riscv-port-branch: 4 new changesets

[duke]

Changeset: 6818b693
Author:    yadongw <yadonn.wang at huawei.com>
Date:      2021-10-21 09:38:47 +0000
URL:       https://git.openjdk.java.net/jdk-sandbox/commit/6818b6938f6c116352215ad97faf5bd26e8c33c2

use t1 as rFlagsReg in c2

! src/hotspot/cpu/riscv/gc/shenandoah/shenandoah_riscv64.ad
! src/hotspot/cpu/riscv/gc/z/z_riscv64.ad
! src/hotspot/cpu/riscv/riscv.ad
! src/hotspot/cpu/riscv/riscv_vext.ad
! src/hotspot/share/opto/memnode.hpp
! src/hotspot/share/opto/subnode.hpp

Changeset: eb2d2ad4
Author:    yadongw <yadonn.wang at huawei.com>
Date:      2021-10-21 11:24:01 +0000
URL:       https://git.openjdk.java.net/jdk-sandbox/commit/eb2d2ad4dabbe04d86175f1a4bb236c17de89227

use t1 as the color register in c1 load barriers of zgc

! src/hotspot/cpu/riscv/gc/z/zBarrierSetAssembler_riscv.cpp
! src/hotspot/cpu/riscv/gc/z/zBarrierSetAssembler_riscv.hpp
! src/hotspot/share/gc/z/c1/zBarrierSetC1.cpp

Changeset: 682102fa
Author:    yadongw <yadonn.wang at huawei.com>
Date:      2021-10-21 11:25:25 +0000
URL:       https://git.openjdk.java.net/jdk-sandbox/commit/682102fa12c6a41cf786ff714544fd7d47dd4b7a

move lir_brach to lir_op2; move lir_cmove to lir_op4

! src/hotspot/cpu/riscv/c1_LIRAssembler_riscv.cpp
! src/hotspot/share/c1/c1_LIR.cpp
! src/hotspot/share/c1/c1_LIR.hpp
! src/hotspot/share/c1/c1_LIRAssembler.cpp
! src/hotspot/share/c1/c1_LIRAssembler.hpp
! src/hotspot/share/c1/c1_LinearScan.cpp

Changeset: 8b971463
Author:    yadongw <yadonn.wang at huawei.com>
Date:      2021-10-21 17:01:43 +0000
URL:       https://git.openjdk.java.net/jdk-sandbox/commit/8b971463cbfe2a722070e93111cdf99b96976ccb

add comments to disabled c1 optimizaitons on riscv

! src/hotspot/share/c1/c1_LinearScan.cpp