[llvm] [llvm][ADT] Add wrappers to `std::fill` (PR #146681)

[Rahul Joshi via llvm-commits]

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@@ -1591,6 +1591,18 @@ TEST(STLExtrasTest, Includes) {
   }
 }
 
+TEST(STLExtrasTest, Fill) {
+  std::vector<int> V1 = {1, 2, 3};
+  std::vector<int> V2;
+  int Val = 4;
+  auto SameToVal = [&](int V) { return V == Val; };
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jurahul wrote:

nit: can you rename this to `IsSameAsVal`?

https://github.com/llvm/llvm-project/pull/146681