Remove \brief commands from doxygen comments.

We've been running doxygen with the autobrief option for a couple of
years now. This makes the \brief markers into our comments
redundant. Since they are a visual distraction and we don't want to
encourage more \brief markers in new code either, this patch removes
them all.

Patch produced by

  for i in $(git grep -l '\\brief'); do perl -pi -e 's/\\brief //g' $i & done

Differential Revision: https://reviews.llvm.org/D46290

llvm-svn: 331272
diff --git a/llvm/lib/CodeGen/AsmPrinter/ByteStreamer.h b/llvm/lib/CodeGen/AsmPrinter/ByteStreamer.h
index e5941de..2163cc7 100644
--- a/llvm/lib/CodeGen/AsmPrinter/ByteStreamer.h
+++ b/llvm/lib/CodeGen/AsmPrinter/ByteStreamer.h
@@ -76,7 +76,7 @@
   SmallVectorImpl<char> &Buffer;
   SmallVectorImpl<std::string> &Comments;
 
-  /// \brief Only verbose textual output needs comments.  This will be set to
+  /// Only verbose textual output needs comments.  This will be set to
   /// true for that case, and false otherwise.  If false, comments passed in to
   /// the emit methods will be ignored.
   bool GenerateComments;