[clang] [LifetimeSafety] Track STL algorithm functions that return lifetimebound iterators (PR #179227)

[Oliver Stöneberg via cfe-commits]

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@@ -429,6 +429,29 @@ int *returnPtrToLocalArray() {
   return std::begin(a); // TODO
 }
 
+namespace lifetimebound_stl_algorithms {
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firewave wrote:

I know these tests are only there to satisfy the patterns but they are fundamentally flawed.

They unconditionally dereference an (potentially) invalid iterator (`end()`) or use mismatching iterators (`begin()` and `end()` from two different temporary objects).

https://github.com/llvm/llvm-project/pull/179227