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/CloneFunction.cpp b/llvm/lib/Transforms/Utils/CloneFunction.cpp
index efef340..5fce77e 100644
--- a/llvm/lib/Transforms/Utils/CloneFunction.cpp
+++ b/llvm/lib/Transforms/Utils/CloneFunction.cpp
@@ -710,7 +710,7 @@
                             ModuleLevelChanges, Returns, NameSuffix, CodeInfo);
 }
 
-/// \brief Remaps instructions in \p Blocks using the mapping in \p VMap.
+/// Remaps instructions in \p Blocks using the mapping in \p VMap.
 void llvm::remapInstructionsInBlocks(
     const SmallVectorImpl<BasicBlock *> &Blocks, ValueToValueMapTy &VMap) {
   // Rewrite the code to refer to itself.
@@ -720,7 +720,7 @@
                        RF_NoModuleLevelChanges | RF_IgnoreMissingLocals);
 }
 
-/// \brief Clones a loop \p OrigLoop.  Returns the loop and the blocks in \p
+/// Clones a loop \p OrigLoop.  Returns the loop and the blocks in \p
 /// Blocks.
 ///
 /// Updates LoopInfo and DominatorTree assuming the loop is dominated by block
@@ -784,7 +784,7 @@
   return NewLoop;
 }
 
-/// \brief Duplicate non-Phi instructions from the beginning of block up to
+/// Duplicate non-Phi instructions from the beginning of block up to
 /// StopAt instruction into a split block between BB and its predecessor.
 BasicBlock *
 llvm::DuplicateInstructionsInSplitBetween(BasicBlock *BB, BasicBlock *PredBB,