[compiler-rt][asan] Add wcscpy/wcsncpy; enable wcscat/wcsncat on Windows (#160493) Summary - Add ASan interceptors for wcscpy/wcsncpy on all platforms. - Enable wcscat/wcsncat on Windows (already enabled on POSIX via sanitizer_common). Motivation - Use of wchar string APIs is common on Windows; improve parity with char* string checks. Changes - Implement wcscpy/wcsncpy in asan_interceptors.cpp; check overlap and mark read/write ranges in bytes. - wcsncpy: compute write size in bytes (size * sizeof(wchar_t)) to avoid missed overflows when sizeof(wchar_t) != 1. - Use MaybeRealWcsnlen when available to bound reads. - Register Windows static thunk for wcscpy/wcsncpy/wcscat/wcsncat; rely on sanitizer_common interceptors for wcscat/wcsncat. - Tests: add wcscpy/wcsncpy/wcscat/wcsncat; flush stdout before crash; use resilient FileCheck patterns (reuse [[ADDR]], wildcard for function suffixes and paths, flexible line numbers). Testing - AArch64 Linux: new tests pass with check-asan locally. Follow-up to and based on prior work in PR #90909 (author: branh, Microsoft); builds on that work and addresses review feedback. Thanks! --------- Signed-off-by: Yixuan Cao <caoyixuan2019@email.szu.edu.cn>
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