[llvm] [LoopInfo] Derive Loop::contains(BlockT*) from the block-to-loop map (PR #207613)

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``````````bash
git-clang-format --diff origin/main HEAD --extensions cpp,h -- llvm/include/llvm/Support/GenericLoopInfo.h llvm/include/llvm/Support/GenericLoopInfoImpl.h llvm/lib/Transforms/Scalar/LoopSimplifyCFG.cpp llvm/lib/Transforms/Scalar/SimpleLoopUnswitch.cpp llvm/lib/Transforms/Utils/FixIrreducible.cpp --diff_from_common_commit
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``````````diff
diff --git a/llvm/include/llvm/Support/GenericLoopInfo.h b/llvm/include/llvm/Support/GenericLoopInfo.h
index 7b43eca8b..20e6e1d1b 100644
--- a/llvm/include/llvm/Support/GenericLoopInfo.h
+++ b/llvm/include/llvm/Support/GenericLoopInfo.h
@@ -482,9 +482,7 @@ protected:
   /// This creates an empty loop.
   LoopBase() : ParentLoop(nullptr) {}
 
-  explicit LoopBase(BlockT *BB) : ParentLoop(nullptr) {
-    Blocks.push_back(BB);
-  }
+  explicit LoopBase(BlockT *BB) : ParentLoop(nullptr) { Blocks.push_back(BB); }
 
   // Since loop passes like SCEV are allowed to key analysis results off of
   // `Loop` pointers, we cannot re-use pointers within a loop pass manager.

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https://github.com/llvm/llvm-project/pull/207613