[llvm] [GenericCycle] Add a Cache for getExitBlocks in GenericCycle (PR #112290)

[Sameer Sahasrabuddhe via llvm-commits]

================
@@ -74,12 +74,16 @@ template <typename ContextT> class GenericCycle {
   ///       always have the same depth.
   unsigned Depth = 0;
 
+  /// Cache for the results of GetExitBlocks
+  std::unique_ptr<SmallVector<BlockT *, 4>> ExitBlocksCache;
----------------
ssahasra wrote:

This unique_ptr is not required. The cache is just a vector and it does not even own the pointers in it. The vector can be declared without being a unique_ptr.

https://github.com/llvm/llvm-project/pull/112290