[clang] [-Wunsafe-buffer-usage] Do not warn about class methods with libc function names (PR #151270)

[David Tarditi via cfe-commits]

dtarditi wrote:

I agree that we should probably check for the function being in the global scope or the `std` namespace.  I think you can use  `isGlobal` and `isStdNamespace`  (in Decl.h and DeclBase.h respectively) to do those checks.


https://github.com/llvm/llvm-project/pull/151270