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/RenameIndependentSubregs.cpp b/llvm/lib/CodeGen/RenameIndependentSubregs.cpp
index 1e1f36a..e25e53a 100644
--- a/llvm/lib/CodeGen/RenameIndependentSubregs.cpp
+++ b/llvm/lib/CodeGen/RenameIndependentSubregs.cpp
@@ -77,20 +77,20 @@
   /// Split unrelated subregister components and rename them to new vregs.
   bool renameComponents(LiveInterval &LI) const;
 
-  /// \brief Build a vector of SubRange infos and a union find set of
+  /// Build a vector of SubRange infos and a union find set of
   /// equivalence classes.
   /// Returns true if more than 1 equivalence class was found.
   bool findComponents(IntEqClasses &Classes,
                       SmallVectorImpl<SubRangeInfo> &SubRangeInfos,
                       LiveInterval &LI) const;
 
-  /// \brief Distribute the LiveInterval segments into the new LiveIntervals
+  /// Distribute the LiveInterval segments into the new LiveIntervals
   /// belonging to their class.
   void distribute(const IntEqClasses &Classes,
                   const SmallVectorImpl<SubRangeInfo> &SubRangeInfos,
                   const SmallVectorImpl<LiveInterval*> &Intervals) const;
 
-  /// \brief Constructs main liverange and add missing undef+dead flags.
+  /// Constructs main liverange and add missing undef+dead flags.
   void computeMainRangesFixFlags(const IntEqClasses &Classes,
       const SmallVectorImpl<SubRangeInfo> &SubRangeInfos,
       const SmallVectorImpl<LiveInterval*> &Intervals) const;