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

llvm-svn: 170502
diff --git a/llvm/lib/Bitcode/Writer/BitcodeWriter.cpp b/llvm/lib/Bitcode/Writer/BitcodeWriter.cpp
index ffe95d8..5217a27 100644
--- a/llvm/lib/Bitcode/Writer/BitcodeWriter.cpp
+++ b/llvm/lib/Bitcode/Writer/BitcodeWriter.cpp
@@ -175,7 +175,7 @@
     for (unsigned i = 0, e = A.getNumSlots(); i != e; ++i) {
       const AttributeWithIndex &PAWI = A.getSlot(i);
       Record.push_back(PAWI.Index);
-      Record.push_back(Attributes::encodeLLVMAttributesForBitcode(PAWI.Attrs));
+      Record.push_back(Attribute::encodeLLVMAttributesForBitcode(PAWI.Attrs));
     }
 
     Stream.EmitRecord(bitc::PARAMATTR_CODE_ENTRY, Record);