Add a clarifying comment.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@127715 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Transforms/Scalar/ScalarReplAggregates.cpp b/lib/Transforms/Scalar/ScalarReplAggregates.cpp
index e1b79fb..d96f3ae 100644
--- a/lib/Transforms/Scalar/ScalarReplAggregates.cpp
+++ b/lib/Transforms/Scalar/ScalarReplAggregates.cpp
@@ -219,7 +219,7 @@
 /// optimization, which scans the uses of an alloca and determines if it can
 /// rewrite it in terms of a single new alloca that can be mem2reg'd.
 class ConvertToScalarInfo {
-  /// AllocaSize - The size of the alloca being considered.
+  /// AllocaSize - The size of the alloca being considered in bytes.
   unsigned AllocaSize;
   const TargetData &TD;