[clang] [-Wunsafe-buffer-usage] Add a new warning for uses of std::span two-parameter constructors (PR #77148)

[via cfe-commits]

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@@ -12075,6 +12075,9 @@ def note_unsafe_buffer_variable_fixit_together : Note<
   "%select{|, and change %2 to safe types to make function %4 bounds-safe}3">;
 def note_safe_buffer_usage_suggestions_disabled : Note<
   "pass -fsafe-buffer-usage-suggestions to receive code hardening suggestions">;
+def warn_unsafe_buffer_usage_in_container : Warning<
+  "%select{the two-parameter std::span construction is unsafe as it can introduce mismatch between buffer size and the bound information}0">,
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jkorous-apple wrote:

Looks like we should remove the select.

https://github.com/llvm/llvm-project/pull/77148