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/StackMapLivenessAnalysis.cpp b/llvm/lib/CodeGen/StackMapLivenessAnalysis.cpp
index cc9af92..32d6f54 100644
--- a/llvm/lib/CodeGen/StackMapLivenessAnalysis.cpp
+++ b/llvm/lib/CodeGen/StackMapLivenessAnalysis.cpp
@@ -39,7 +39,7 @@
 STATISTIC(NumStackMaps,           "Number of StackMaps visited");
 
 namespace {
-/// \brief This pass calculates the liveness information for each basic block in
+/// This pass calculates the liveness information for each basic block in
 /// a function and attaches the register live-out information to a patchpoint
 /// intrinsic if present.
 ///
@@ -54,10 +54,10 @@
 public:
   static char ID;
 
-  /// \brief Default construct and initialize the pass.
+  /// Default construct and initialize the pass.
   StackMapLiveness();
 
-  /// \brief Tell the pass manager which passes we depend on and what
+  /// Tell the pass manager which passes we depend on and what
   /// information we preserve.
   void getAnalysisUsage(AnalysisUsage &AU) const override;
 
@@ -66,17 +66,17 @@
         MachineFunctionProperties::Property::NoVRegs);
   }
 
-  /// \brief Calculate the liveness information for the given machine function.
+  /// Calculate the liveness information for the given machine function.
   bool runOnMachineFunction(MachineFunction &MF) override;
 
 private:
-  /// \brief Performs the actual liveness calculation for the function.
+  /// Performs the actual liveness calculation for the function.
   bool calculateLiveness(MachineFunction &MF);
 
-  /// \brief Add the current register live set to the instruction.
+  /// Add the current register live set to the instruction.
   void addLiveOutSetToMI(MachineFunction &MF, MachineInstr &MI);
 
-  /// \brief Create a register mask and initialize it with the registers from
+  /// Create a register mask and initialize it with the registers from
   /// the register live set.
   uint32_t *createRegisterMask(MachineFunction &MF) const;
 };