文件结构调整

示例：lldb 项目添加 RISC-V 相关文件

项目链接：https://gitee.com/src-openeuler/lldb
对应 RISC-V Patch 文件：0006-add-some-reg-info-for-RISC-V.patch

项目原有部分文件列表：

/source/Plugins/Process/Linux/NativeRegisterContextLinux_arm.cpp
/source/Plugins/Process/Linux/NativeRegisterContextLinux_arm.h
/source/Plugins/Process/Linux/NativeRegisterContextLinux_arm64.cpp
/source/Plugins/Process/Linux/NativeRegisterContextLinux_arm64.h
/source/Plugins/Process/Linux/NativeRegisterContextLinux_mips64.cpp
/source/Plugins/Process/Linux/NativeRegisterContextLinux_mips64.h
/source/Plugins/Process/Linux/NativeRegisterContextLinux_ppc64le.cpp
/source/Plugins/Process/Linux/NativeRegisterContextLinux_ppc64le.h
/source/Plugins/Process/Linux/NativeRegisterContextLinux_s390x.cpp
/source/Plugins/Process/Linux/NativeRegisterContextLinux_s390x.h
/source/Plugins/Process/Linux/NativeRegisterContextLinux_x86_64.cpp
/source/Plugins/Process/Linux/NativeRegisterContextLinux_x86_64.h

根据高亮部分的架构关键字，需要补充以下文件以支持 RISC-V 64 位架构：

/source/Plugins/Process/Linux/NativeRegisterContextLinux_riscv64.cpp
/source/Plugins/Process/Linux/NativeRegisterContextLinux_riscv64.h