Attempt to fix dragonegg. Use the number of slots to determine if the AttributeSet has attributes or not.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@173902 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/IR/Verifier.cpp b/lib/IR/Verifier.cpp
index 39f95fa..2d69493 100644
--- a/lib/IR/Verifier.cpp
+++ b/lib/IR/Verifier.cpp
@@ -797,7 +797,7 @@
 }
 
 static bool VerifyAttributeCount(const AttributeSet &Attrs, unsigned Params) {
-  if (Attrs.isEmpty())
+  if (Attrs.getNumSlots() == 0)
     return true;
 
   unsigned LastSlot = Attrs.getNumSlots() - 1;