[LLDB][LLVM] stl and self-defined return value showing when step up from function · Pull Request !721 · OpenHarmony/third_party_llvm-project

1. Description: Implemented the struct return value logic in aarch64. Mad…
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### Issue
https://gitee.com/openharmony/third_party_llvm-project/issues/IBIHF3

### Reason (Purpose, Solved Problem)
When step out from a function with stl and self-defined return value, Developers can not see return values.
Current lldb and ide can only show basic type return value.

### Description
Provide return value when using lldb to debug. It should be able to show stl type and self-defined return
value when using step-out/finish command when stopeed in a function.

Implement storing return value logic in llvm.
Implement gettting return value logic in lldb.
The changes only apply to aarch64-linux-ohos, and when compile type is -O0
### Test (Local test)
The test with different kinds of return value functions is written and the test file is 
also in this pull request,
the test includes  return value type of class/struct/vector/list/stack/string and also class with inheritance. The
test is passed:
![输入图片说明](https://foruda.gitee.com/images/1741766645368712440/700ff312_14833253.png "屏幕截图")

And also passed all llvm tests using ./llvm-lit -v --xunit-xml-output=clang-llvm-test.xml  ../../../toolchain/llvm-project/clang/test ../../../toolchain/llvm-project/llvm/test

Testing Time: 881.73s
  Unsupported      : 10676
  Passed           : 47177
  Expectedly Failed:   157

Finally, we compile the test cpp file to ll file, and use ./llvm/utils/update_llc_test_checks.py to generate assembly code of the ll file to compare, and also use llvm-lit to test
if the generated assembly code comply with the correct one. The test passed.
### 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) 
N

类型	指派人员	状态
审查	hhj 已审查通过 Pavel Kosov	已完成 (1/1人)
测试	openharmony_ci 已测试通过 public_ARKCIAccount 已测试通过	已完成 (2/1人)

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