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/Transforms/Utils/LoopVersioning.cpp b/llvm/lib/Transforms/Utils/LoopVersioning.cpp
index 29756d9..95e9a186 100644
--- a/llvm/lib/Transforms/Utils/LoopVersioning.cpp
+++ b/llvm/lib/Transforms/Utils/LoopVersioning.cpp
@@ -248,7 +248,7 @@
 }
 
 namespace {
-/// \brief Also expose this is a pass.  Currently this is only used for
+/// Also expose this is a pass.  Currently this is only used for
 /// unit-testing.  It adds all memchecks necessary to remove all may-aliasing
 /// array accesses from the loop.
 class LoopVersioningPass : public FunctionPass {