[NewGVN] We don't use postdom info anymore. Update.

Differential Revision:  https://reviews.llvm.org/D28842

llvm-svn: 292421

llvm/lib/Transforms/Scalar/NewGVN.cpp

@@ -255,7 +255,6 @@ public:
               TargetLibraryInfo *TLI, AliasAnalysis *AA, MemorySSA *MSSA);
 
 private:
-  // This transformation requires dominator postdominator info.
   void getAnalysisUsage(AnalysisUsage &AU) const override {
     AU.addRequired<AssumptionCacheTracker>();
     AU.addRequired<DominatorTreeWrapperPass>();