[llvm] [SLP] Use static_assert() rather than assert() where possible (PR #180867)

[Jakub Kuderski via llvm-commits]

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@@ -1975,6 +1975,22 @@ template <typename R> bool is_sorted(R &&Range) {
   return std::is_sorted(adl_begin(Range), adl_end(Range));
 }
 
+/// Check if elements in a range \p R are sorted with respect to a comparator \p
+/// C. constexpr allows use in static_assert
+/// TODO: Use std::is_sorted once upgraded to Cpp20
+template <typename It, typename Cmp = std::less<>>
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kuhar wrote:

This should probably go to STLForwardCompat.h

https://github.com/llvm/llvm-project/pull/180867