Rename the 'Attributes' class to 'Attribute'. It's going to represent a single attribute in the future.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@170502 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Bitcode/Writer/ValueEnumerator.cpp b/lib/Bitcode/Writer/ValueEnumerator.cpp
index 3c2cce0..354b506 100644
--- a/lib/Bitcode/Writer/ValueEnumerator.cpp
+++ b/lib/Bitcode/Writer/ValueEnumerator.cpp
@@ -424,8 +424,8 @@
   unsigned &Entry = AttributeMap[PAL.getRawPointer()];
   if (Entry == 0) {
     // Never saw this before, add it.
-    Attributes.push_back(PAL);
-    Entry = Attributes.size();
+    Attribute.push_back(PAL);
+    Entry = Attribute.size();
   }
 }