[Alignment][NFC] Remove StoreInst::setAlignment(unsigned)

Summary:
This is patch is part of a series to introduce an Alignment type.
See this thread for context: http://lists.llvm.org/pipermail/llvm-dev/2019-July/133851.html
See this patch for the introduction of the type: https://reviews.llvm.org/D64790

Reviewers: courbet, bollu, jdoerfert

Subscribers: hiraditya, asbirlea, cfe-commits, llvm-commits

Tags: #clang, #llvm

Differential Revision: https://reviews.llvm.org/D68268

llvm-svn: 373595
diff --git a/llvm/lib/Transforms/Scalar/AlignmentFromAssumptions.cpp b/llvm/lib/Transforms/Scalar/AlignmentFromAssumptions.cpp
index 2d135b4..0e9f03a 100644
--- a/llvm/lib/Transforms/Scalar/AlignmentFromAssumptions.cpp
+++ b/llvm/lib/Transforms/Scalar/AlignmentFromAssumptions.cpp
@@ -329,7 +329,7 @@
         SI->getPointerOperand(), SE);
 
       if (NewAlignment > SI->getAlignment()) {
-        SI->setAlignment(NewAlignment);
+        SI->setAlignment(MaybeAlign(NewAlignment));
         ++NumStoreAlignChanged;
       }
     } else if (MemIntrinsic *MI = dyn_cast<MemIntrinsic>(J)) {