[OHOS][scudo][gwp_asan][CFI][test] Fix compiler-rt (scudo, gwp_asan, CFI) testing system for OHOS · Pull Request !597 · OpenHarmony/third_party_llvm-project

### Issue
https://gitee.com/openharmony/third_party_llvm-project/issues/IAQMY0

### Reason (Purpose, Solved Problem)
Currently, the scudo/GWPAsan tests fail to start because of link or exec format errors, or fail with segfaults.

### Description
- disable emulated tls in scudo and gwp_asan;
- don't build gwp_asan unit tests under check-gwp_asan target;
- make gwp_asan tls slot getter weak, so that it links without errors;
- provide gwp_asan backtrace functions from musl;
- address some musl-related test limitations;
- enable CFI tests on OHOS.

### Test (Local test)
After the fixes, all tests link and start correctly, but the following tests fail:
- `ScudoCUnitTest`'s `ScudoWrappersCTest.MallocInfo` (because `malloc_info` isn't weak in our musl);
- gwp-asan's `backtrace.c`;
- `GwpAsan`'s unit tests `BacktraceGuardedPoolAllocatorDeathTest.{DoubleFree, UseAfterFree}` (these three have problems in stacktraces, needs more investigation);

### 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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