Use the right version of "append" to combine two SmallVectors.
This fixes the compile-time regressions seen in last night's tests.

llvm-svn: 103118
diff --git a/llvm/lib/Transforms/Scalar/GVN.cpp b/llvm/lib/Transforms/Scalar/GVN.cpp
index 65b34b1..fdd1766 100644
--- a/llvm/lib/Transforms/Scalar/GVN.cpp
+++ b/llvm/lib/Transforms/Scalar/GVN.cpp
@@ -1604,7 +1604,7 @@
     }
   }
   if (!NeedToSplit.empty()) {
-    toSplit.append(NeedToSplit.size(), NeedToSplit.front());
+    toSplit.append(NeedToSplit.begin(), NeedToSplit.end());
     return false;
   }