git: openjdk/jdk-sandbox: riscv-port-branch: RISCV: fix comments

[duke]

Changeset: b1ca9b16
Author:    Fei Yang <felix.yang at huawei.com>
Date:      2021-11-07 02:20:50 +0000
URL:       https://git.openjdk.java.net/jdk-sandbox/commit/b1ca9b162306bccf6aff71f1e41560d4275f81d8

RISCV: fix comments

! src/hotspot/cpu/riscv/c1_FrameMap_riscv.cpp
! src/hotspot/cpu/riscv/c1_LIRAssembler_riscv.cpp
! src/hotspot/cpu/riscv/registerMap_riscv.hpp