Use the new 'getSlotIndex' method to retrieve the attribute's slot index.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@173499 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Bitcode/Writer/BitcodeWriter.cpp b/lib/Bitcode/Writer/BitcodeWriter.cpp
index 4ee762e..cc6b8b3 100644
--- a/lib/Bitcode/Writer/BitcodeWriter.cpp
+++ b/lib/Bitcode/Writer/BitcodeWriter.cpp
@@ -174,7 +174,7 @@
     const AttributeSet &A = Attrs[i];
     for (unsigned i = 0, e = A.getNumSlots(); i != e; ++i) {
       const AttributeWithIndex &PAWI = A.getSlot(i);
-      Record.push_back(PAWI.Index);
+      Record.push_back(A.getSlotIndex(i));
       Record.push_back(Attribute::encodeLLVMAttributesForBitcode(PAWI.Attrs));
     }