moved Writer.cpp -> BitcodeWriter.cpp to make it more unique in the tree.

llvm-svn: 36549
diff --git a/llvm/lib/Bitcode/Writer/BitcodeWriter.cpp b/llvm/lib/Bitcode/Writer/BitcodeWriter.cpp
index 421316c..5851710 100644
--- a/llvm/lib/Bitcode/Writer/BitcodeWriter.cpp
+++ b/llvm/lib/Bitcode/Writer/BitcodeWriter.cpp
@@ -1,4 +1,4 @@
-//===--- Bitcode/Writer/Writer.cpp - Bitcode Writer -----------------------===//
+//===--- Bitcode/Writer/BitcodeWriter.cpp - Bitcode Writer ----------------===//
 //
 //                     The LLVM Compiler Infrastructure
 //