[libc] Unify and extend no_sanitize attributes for strlen. (#161316) Fast strlen implementations (naive wide-reads, SIMD-based, and x86_64/aarch64-optimized versions) all may perform technically-out-of-bound reads, which leads to reports under ASan, HWASan (on ARM machines), and also TSan (which also has the capability to detect heap out-of-bound reads). So, we need to explicitly disable instrumentation in all three cases. Tragically, Clang didn't support `[[gnu::no_sanitize]]` syntax until recently, and since we're supporting both GCC and Clang, we have to revert to `__attribute__` syntax.
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