[llvm] [ADT] Use SmallPtrSet or SmallSet flexibly (NFC) (PR #154680)

[Jakub Kuderski via llvm-commits]

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@@ -387,9 +387,13 @@ TYPED_TEST(DenseMapTest, ConstIteratorTest) {
   EXPECT_TRUE(cit == cit2);
 }
 
+template <typename T, unsigned N>
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kuhar wrote:

Can you add a comment explaining what the intention behind this is?

https://github.com/llvm/llvm-project/pull/154680