[CGP] Remove unnecessary MaybeAlign use (NFC)

Stores now always have an alignment.

Author: nikic

llvm/lib/CodeGen/CodeGenPrepare.cpp

@@ -7083,13 +7083,13 @@ static bool splitMergedValStore(StoreInst &SI, const DataLayout &DL,
     Value *Addr = Builder.CreateBitCast(
         SI.getOperand(1),
         SplitStoreType->getPointerTo(SI.getPointerAddressSpace()));
+    Align Alignment = SI.getAlign();
     const bool IsOffsetStore = (IsLE && Upper) || (!IsLE && !Upper);
-    if (IsOffsetStore)
+    if (IsOffsetStore) {
       Addr = Builder.CreateGEP(
           SplitStoreType, Addr,
           ConstantInt::get(Type::getInt32Ty(SI.getContext()), 1));
-    MaybeAlign Alignment = SI.getAlign();
-    if (IsOffsetStore && Alignment) {
+
       // When splitting the store in half, naturally one half will retain the
       // alignment of the original wider store, regardless of whether it was
       // over-aligned or not, while the other will require adjustment.