git: openjdk/jdk-sandbox: riscv-port-branch: Avoid emitting fence.i instruction in SharedRuntime::generate_handler_blob for riscv port

[duke]

Changeset: 630f79da
Author:    Fei Yang <felix.yang at huawei.com>
Date:      2021-09-30 11:27:47 +0000
URL:       https://git.openjdk.java.net/jdk-sandbox/commit/630f79da2c2704b5b5efa412d7ce5e1bbf8e26f8

Avoid emitting fence.i instruction in SharedRuntime::generate_handler_blob for riscv port
Reference issue: 8221554: aarch64 cross-modifying code
Previously, this redundant fence.i instruction was missed when follow this issue.

Reviewed-by: Yadong Wang <yadonn.wang at huawei.com>

! src/hotspot/cpu/riscv64/sharedRuntime_riscv64.cpp