[Struct Reorg] Add Safe Structure Pointer Compression · Pull Request !113 · openEuler/gcc

**PR功能描述 / 为什么需要这个合入：**
回合GCC 10上的特性至GCC 12

**希望检视人员了解的内容：**
原PR：
https://gitee.com/openeuler/gcc/pulls/64

**Checklist:**
PR格式
- [x] PR title是否和commit message title一致
- [x] commit message是否使用模板，请配置`git config commit.template .gitee/commit_message`
- [ ] PR是否关联issue
- [x] PR是否设置审查人员（主要成员ID为eastb233，李彦成，黄晓权）

功能验证
- 修改涉及后端架构
  - [ ] AArch64
  - [ ] X86_64
- [x] GCC自举构建是否通过，参考[Wiki](https://gitee.com/openeuler/gcc/wikis/%E5%A6%82%E4%BD%95%E8%B4%A1%E7%8C%AE%20openEuler%20GCC%20%E7%A4%BE%E5%8C%BA)
- [x] GCC deja测试是否通过，并附上测试结果
```
[root@localhost testsuite]# runtest --tool gcc struct-reorg.exp
WARNING: Couldn't find the global config file.
Test run by root on Wed Aug 16 21:28:50 2023
Native configuration is aarch64-unknown-linux-gnu

=== gcc tests ===

Schedule of variations:
    unix

Running target unix
Using /usr/share/dejagnu/baseboards/unix.exp as board description file for target.
Using /usr/share/dejagnu/config/unix.exp as generic interface file for target.
Using ./config/default.exp as tool-and-target-specific interface file.
Running ./gcc.dg/struct/struct-reorg.exp ...

=== gcc Summary ===

# of expected passes		354
# of expected failures		18
/home/lyc/gcc/install-gcc-12-dev/bin/gcc  version 12.3.1 (GCC) 
```

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