[compiler-rt] [compiler-rt][asan] Reland: wcscpy/wcsncpy interceptors and stabilize wchar tests on Darwin/Android (PR #162028)

[Yixuan Cao via llvm-commits]

Cao-Wuhui wrote:

> Could you please make this pull request a stack of three commits (in one pull request):
> 
> * reland [[compiler-rt][asan] Add wcscpy/wcsncpy; enable wcscat/wcsncat on Windows #160493](https://github.com/llvm/llvm-project/pull/160493)
> * reland [[compiler-rt][asan][tests] Stabilize wchar tests on Darwin/Android #161624](https://github.com/llvm/llvm-project/pull/161624) (fix [Fixing Rust build #1](https://github.com/llvm/llvm-project/pull/1))
> * new fix (DAG group?)
> 
> It would make this much easier to see what's been fixed. (The commits will be automatically squashed before merging, so it won't negataively affect the LLVM commit history.)

Thank you for the review and guidance, I’ve split this PR into a stack of 3 commits. Please let me know if any further adjustments would be helpful. I’d be happy to revise. 

https://github.com/llvm/llvm-project/pull/162028