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/unittests/IR/PassManagerTest.cpp b/llvm/unittests/IR/PassManagerTest.cpp
index 0131bce..7709453 100644
--- a/llvm/unittests/IR/PassManagerTest.cpp
+++ b/llvm/unittests/IR/PassManagerTest.cpp
@@ -28,7 +28,7 @@
 
   TestFunctionAnalysis(int &Runs) : Runs(Runs) {}
 
-  /// \brief Run the analysis pass over the function and return a result.
+  /// Run the analysis pass over the function and return a result.
   Result run(Function &F, FunctionAnalysisManager &AM) {
     ++Runs;
     int Count = 0;