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/MacroFusion.cpp b/llvm/lib/CodeGen/MacroFusion.cpp
index e7f426c..5b3523b 100644
--- a/llvm/lib/CodeGen/MacroFusion.cpp
+++ b/llvm/lib/CodeGen/MacroFusion.cpp
@@ -105,7 +105,7 @@
 
 namespace {
 
-/// \brief Post-process the DAG to create cluster edges between instrs that may
+/// Post-process the DAG to create cluster edges between instrs that may
 /// be fused by the processor into a single operation.
 class MacroFusion : public ScheduleDAGMutation {
   ShouldSchedulePredTy shouldScheduleAdjacent;
@@ -135,7 +135,7 @@
     scheduleAdjacentImpl(*DAG, DAG->ExitSU);
 }
 
-/// \brief Implement the fusion of instr pairs in the scheduling DAG,
+/// Implement the fusion of instr pairs in the scheduling DAG,
 /// anchored at the instr in AnchorSU..
 bool MacroFusion::scheduleAdjacentImpl(ScheduleDAGMI &DAG, SUnit &AnchorSU) {
   const MachineInstr &AnchorMI = *AnchorSU.getInstr();