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/LoopUnrollPeel.cpp b/llvm/lib/Transforms/Utils/LoopUnrollPeel.cpp
index 555e328..96d9acd 100644
--- a/llvm/lib/Transforms/Utils/LoopUnrollPeel.cpp
+++ b/llvm/lib/Transforms/Utils/LoopUnrollPeel.cpp
@@ -338,7 +338,7 @@
   }
 }
 
-/// \brief Update the branch weights of the latch of a peeled-off loop
+/// Update the branch weights of the latch of a peeled-off loop
 /// iteration.
 /// This sets the branch weights for the latch of the recently peeled off loop
 /// iteration correctly. 
@@ -379,7 +379,7 @@
   }
 }
 
-/// \brief Clones the body of the loop L, putting it between \p InsertTop and \p
+/// Clones the body of the loop L, putting it between \p InsertTop and \p
 /// InsertBot.
 /// \param IterNumber The serial number of the iteration currently being
 /// peeled off.
@@ -488,7 +488,7 @@
     LVMap[KV.first] = KV.second;
 }
 
-/// \brief Peel off the first \p PeelCount iterations of loop \p L.
+/// Peel off the first \p PeelCount iterations of loop \p L.
 ///
 /// Note that this does not peel them off as a single straight-line block.
 /// Rather, each iteration is peeled off separately, and needs to check the