fix typo error in DivergenceAnalysis.h

Fix a typo error in the comment in DivergenceAnalysis.h

Reviewed By: asbirlea

Differential Revision: https://reviews.llvm.org/D125808

llvm/include/llvm/Analysis/DivergenceAnalysis.h

@@ -41,7 +41,7 @@ public:
   /// \param RegionLoop if non-null the analysis is restricted to \p RegionLoop.
   /// Otherwise the whole function is analyzed.
   /// \param IsLCSSAForm whether the analysis may assume that the IR in the
-  /// region in in LCSSA form.
+  /// region in LCSSA form.
   DivergenceAnalysisImpl(const Function &F, const Loop *RegionLoop,
                          const DominatorTree &DT, const LoopInfo &LI,
                          SyncDependenceAnalysis &SDA, bool IsLCSSAForm);