[llvm] [ADT] Add unit tests for set_subtract (PR #99561)

[Kazu Hirata via llvm-commits]

================
@@ -199,6 +201,42 @@ TEST(SetOperationsTest, SetSubtract) {
   EXPECT_EQ(ExpectedSet2, Set2);
 }
 
+TEST(SetOperationsTest, SetSubtractSmallPtrSet) {
+  int A[4];
+
+  // Set1.size() < Set2.size()
+  llvm::SmallPtrSet<int *, 4> Set1 = {&A[0], &A[1]};
----------------
kazutakahirata wrote:

Fixed in the latest iteration.  Thanks!

https://github.com/llvm/llvm-project/pull/99561