[CIR][NFC] Fix CIR build after CharUnits change (#161580)

My previous attempt to fix this missed one case.
diff --git a/clang/lib/CIR/CodeGen/CIRGenRecordLayoutBuilder.cpp b/clang/lib/CIR/CodeGen/CIRGenRecordLayoutBuilder.cpp
index bf812c8..2baeb43 100644
--- a/clang/lib/CIR/CodeGen/CIRGenRecordLayoutBuilder.cpp
+++ b/clang/lib/CIR/CodeGen/CIRGenRecordLayoutBuilder.cpp
@@ -824,7 +824,7 @@
     appendPaddingBytes(layoutSize - getSize(storageType));
 
   // Set packed if we need it.
-  if (layoutSize % getAlignment(storageType))
+  if (!layoutSize.isMultipleOf(getAlignment(storageType)))
     packed = true;
 }