[MemorySSA] Remove a redundant dyn_cast.

StartingAccess is a MemoryUseOrDef. No need to check again.

llvm-svn: 326000

1 files changed, 2 insertions, 3 deletions

diff --git a/llvm/lib/Analysis/MemorySSA.cpp b/llvm/lib/Analysis/MemorySSA.cpp
index 081344b41e2..584e8855096 100644
--- a/llvm/lib/Analysis/MemorySSA.cpp
+++ b/llvm/lib/Analysis/MemorySSA.cpp
@@ -2029,9 +2029,8 @@ MemorySSA::CachingWalker::getClobberingMemoryAccess(MemoryAccess *MA) {
   // If this is an already optimized use or def, return the optimized result.
   // Note: Currently, we do not store the optimized def result because we'd need
   // a separate field, since we can't use it as the defining access.
-  if (auto *MUD = dyn_cast<MemoryUseOrDef>(StartingAccess))
-    if (MUD->isOptimized())
-      return MUD->getOptimized();
+  if (StartingAccess->isOptimized())
+    return StartingAccess->getOptimized();
 
   const Instruction *I = StartingAccess->getMemoryInst();
   UpwardsMemoryQuery Q(I, StartingAccess);