Suppress some noisy / buggy warnings #1136
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Two warnings were being emitted in the MSVC+LLVM tests.
The warning
-Wunsafe-buffer-usageis initially introduced in some capacity here https://reviews.llvm.org/D137346 pointing to documentation at https://discourse.llvm.org/t/rfc-c-buffer-hardening/65734. The warning is a stylistic checker whose goal is to "emit a warning every time an unsafe operation is performed on a raw pointer". This type of programming model is not useful for library implementations of types such asspan, where direct manipulation of raw pointers is inevitable, so disable the warning altogether.There is also a false-positive warning llvm/llvm-project#65689 that I've disabled inline.