Use empty() instead of comparing size() with zero.

llvm-svn: 46514
diff --git a/llvm/lib/Bitcode/Reader/Deserialize.cpp b/llvm/lib/Bitcode/Reader/Deserialize.cpp
index 3496d24..8455d0e 100644
--- a/llvm/lib/Bitcode/Reader/Deserialize.cpp
+++ b/llvm/lib/Bitcode/Reader/Deserialize.cpp
@@ -115,7 +115,7 @@
   if (Stream.AtEndOfStream())
     return;
   
-  assert (Record.size() == 0);
+  assert (Record.empty());
   assert (AbbrevNo >= bitc::UNABBREV_RECORD);
   RecordCode = Stream.ReadRecord(AbbrevNo,Record);
   assert (Record.size() > 0);