[compiler-rt] Fix sanitizer build issues · Pull Request !391 · OpenHarmony/third_party_llvm-project

### Issue

https://gitee.com/openharmony/third_party_llvm-project/issues/I91GO7

### Reason (Purpose, Solved Problem)

### Description
Do not add `-latomic` flag for `mips` targets, since we do not use `libatomic` on `OHOS`, use compiler-rt instead.  
Add `-lunwind` flag to the `scudo_standalone` for `arm`, since `arm` need unwind info.  
Merge after: https://gitee.com/openharmony/third_party_musl/pulls/1235

Currently we remove `scudo_standalone`'s `-Wl,-z,defs,-z,now,-z,relro` linker flags to avoid search all symbols at build time. This is because we do not always build `musl` with all required symbols. I also created a question on llvm discource about why do we need to resolve all the symbols at build time: https://discourse.llvm.org/t/scudo-standalone-why-is-it-required-to-resolve-all-symbols-at-build-time/77307

### Test (Local test)

### Need to cherry-pick to release (eg：monthly_20221018, OpenHarmony-3.2-Beta5 ...) branch？

- [ ] yes，branch list:
- [x] no

why:

###  Compatibility impact assessment, please indicate (Y/N)

类型	指派人员	状态
审查	hhj Pavel Kosov 已审查通过	已完成 (1/1人)
测试	openharmony_ci 已测试通过	已完成 (1/1人)

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